Precoated sand mold shell mold for planet carrier casting

Abstract

The utility model discloses a precoated sand shell mold for casting a planet carrier. The precoated sand shell mold comprises a lower shell mold and an upper shell mold which are matched with each other, the lower shell mold comprises a fixed mold body and a movable mold body, and the fixed mold body is provided with a planet carrier model, a sprue base, a sprue and a groove; the movable mold body is provided with a mold cavity and a sand shooting opening which are similar to the planet carrier mold in shape and are about mm in size; the upper shell mold comprises a fixed mold body and a movable mold body, and the fixed mold body is provided with an automatic core groove, a sprue and a riser neck which are matched with the planet carrier model; the movable mold body is provided with a dead head, a pouring cup, a sand shooting opening and a mold cavity which is similar to the dead head and the pouring cup in shape and is about mm in size; the number of the planet carrier models and the number of the automatic core grooves are both two. The precoated sand shell mold for planet carrier casting realizes casting production by adopting a precoated sand process, has the advantages of high production efficiency, high casting size precision, high surface smoothness and the like, and has few production procedures and few factors influencing the product quality.

Description

Technical Field

[0001] The utility model relates to the technical field of mold manufacturing, in particular to a coated sand shell mold for planetary carrier casting. Background Art

[0002] Precision RV reducer is a key functional component in industrial robots, a crucial application link in the robot industry chain, and one of the bottlenecks restricting the development of my country's robot industry. The planet carrier is a key part of the RV reducer. Its dimensional accuracy directly affects the motion accuracy of the RV reducer, and its surface finish also has an important impact on the stable operation of the RV reducer.

[0003] like Figure 1 , Figure 2 The planet carrier shown in the figure is made of ZG40Cr. The product batch is large, and the surface finish and dimensional accuracy requirements are high. If the coated sand process is used for casting production, it has the advantages of high productivity, fewer production processes, fewer factors affecting product quality, stable product quality, high surface finish, and high dimensional accuracy. However, the use of coated sand technology has Figure 1 , Figure 2 The planet carrier shown in the figure must be cast and produced by using a coated sand mold (shell) manufacturing device and a mold matching the manufacturing device. The existing coated sand mold (shell) manufacturing device is a double-station vertical core shooting machine that can install and operate two hot core box molds at the same time, but there is no matching device in the prior art for casting such as Figure 1 , Figure 2 The hot box mold for the planet carrier is shown. Utility Model Content

[0004] The utility model aims to provide a coated sand shell mold for planetary carrier casting, so as to solve the problem that there is no matching core shooting machine in the above background technology. Figure 1 , Figure 2 The problem with the planet carrier hot box mold is shown.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a coated sand shell mold for planetary carrier casting, comprising a lower shell mold and an upper shell mold that cooperate with each other;

[0006] The lower shell mold comprises a first fixed mold body and a first movable mold body, wherein the first fixed mold body has a planet carrier model, a gate cavity, a gate, and a groove; the first movable mold body has a first mold cavity and a first sand shooting port which are similar in shape to the planet carrier model and 10 to 20 mm larger in size;

[0007] The upper shell mold comprises a second fixed mold body and a second movable mold body, the second fixed mold body has a self-core groove, a straight runner, and a riser neck matching the planet carrier model; the second movable mold body has a riser, a pouring cup, a second sand shooting port, and a second mold cavity with a shape similar to the riser and the pouring cup and a size 10 to 20 mm larger;

[0008] The planet carrier model and the self-core groove each have two;

[0009] The upper shell mold corresponding to each planet carrier model is provided with two riser necks and risers, and each two riser necks and risers respectively form two risers to compensate for the shrinkage of one planet carrier casting;

[0010] A gate nest, a gate, a sprue, and a gate cup are arranged between the two planet carrier models, and the gate nest, the gate, the sprue, and the gate cup constitute a pouring system;

[0011] The outermost edge size of the first mold cavity of the first movable mold body is larger than the outermost edge size of the groove of the first fixed mold body, and the two can form a first positioning groove of the lower mold shell; the second fixed mold body has a second positioning groove, which can form a positioning boss of the upper mold shell that matches the first positioning groove of the lower mold shell with the second movable mold body.

[0012] As a preferred technical solution of the present utility model, the first fixed mold body is provided with a first positioning hole; the first movable mold body is provided with a first positioning pin matching the first positioning hole.

[0013] As a preferred technical solution of the present utility model, the first fixed mold body is provided with a first heating tube hole penetrating the main body, and a first temperature measuring hole is provided on the side; the first movable mold body is provided with a second heating tube hole penetrating the main body.

[0014] As a preferred technical solution of the present utility model, the first fixed mold body is provided with a first mounting flange, and the first mounting flange is provided with a first mounting hole; the first movable mold body is provided with a second mounting flange, and the second mounting flange is provided with a second mounting hole.

[0015] As the preferred technical solution of the present utility model, the first fixed mold body is provided with a first top plate and a first ejector spring, and the first top plate is provided with a first reset ejector rod and a first mold shell ejector rod; the first movable mold body is provided with a second top plate, and the second top plate is provided with a second reset ejector rod and a second mold shell ejector rod.

[0016] As a preferred technical solution of the present utility model, the second fixed mold body is provided with a second positioning hole; the second movable mold body is provided with a second positioning pin matching the second positioning hole.

[0017] As a preferred technical solution of the present utility model, the second fixed mold body is provided with a third heating tube hole penetrating the main body, and a second temperature measuring hole is provided on the side; the second movable mold body is provided with a fourth heating tube hole penetrating the main body.

[0018] As a preferred technical solution of the present utility model, the second fixed mold body is provided with a third mounting flange, and the third mounting flange is provided with a third mounting hole; the second movable mold body is provided with a fourth mounting flange, and the fourth mounting flange is provided with a fourth mounting hole.

[0019] As the preferred technical solution of the present utility model, the second fixed mold body is provided with a third top plate and a second ejector spring, and the third top plate is provided with a third reset ejector rod and a third mold shell ejector rod; the second movable mold body is provided with a fourth top plate, and the fourth top plate is provided with a fourth reset ejector rod and a fourth mold shell ejector rod.

[0020] As the preferred technical solution of the present utility model, a first threaded hole for lifting is provided above the first fixed mold body; a second threaded hole for lifting is provided above the first movable mold body; a third threaded hole for lifting is provided above the second fixed mold body; and a fourth threaded hole for lifting is provided above the second movable mold body.

[0021] Compared with the prior art, the utility model has the following beneficial effects:

[0022] 1. The utility model is a coated sand shell mold for planetary carrier casting, which is aimed at Figure 1 , Figure 2 The structure of the planet carrier shown in the figure realizes the casting production by using coated sand process, which has the advantages of high production efficiency, high casting size accuracy, high surface finish, etc., and has fewer production processes, fewer factors affecting product quality, and stable product quality;

[0023] 2. The utility model provides a coated sand shell mold for planetary carrier casting, which realizes casting production by using a shell, has low consumption of coated sand, saves paint consumption, shortens production time, and has low production cost;

[0024] 3. The utility model provides a coated sand shell mold for planetary carrier casting. The manufactured shell can be directly provided for pouring, and the production cycle is short;

[0025] 4. The utility model provides a coated sand shell mold for planetary carrier casting, which can realize a "one mold, two pieces" casting method and improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the main structure of the planet carrier casting blank of the utility model;

[0027] Figure 2This is a schematic diagram of the isometric side view of the planet carrier casting blank of the utility model;

[0028] Figure 3 It is an isometric side view structural diagram of the planet carrier casting process of the utility model;

[0029] Figure 4 It is a schematic diagram of the main structure of the fixed mold body of the lower shell mold of the utility model.

[0030] Figure 5 It is a schematic diagram of the cross-sectional structure of the fixed mold body of the lower shell mold of the utility model.

[0031] Figure 6 It is a schematic diagram of the isometric side structure of the fixed mold body of the lower shell mold of the utility model.

[0032] Figure 7 It is a schematic diagram of the main structure of the movable mold body of the lower shell mold of the utility model.

[0033] Figure 8 It is a schematic cross-sectional structure diagram of the movable mold body of the lower shell mold of the utility model.

[0034] Fig. 9 It is a schematic diagram of the isometric side view of the movable mold body of the lower shell mold of the utility model.

[0035] Fig.10 It is a schematic diagram of the main structure of the fixed mold body of the upper shell mold of the utility model.

[0036] Fig.11 It is a schematic cross-sectional structure diagram of the fixed mold body of the upper shell mold of the utility model.

[0037] Fig.12 It is a schematic diagram of the isometric side structure of the fixed mold body of the upper shell mold of the utility model.

[0038] Fig.13 It is a schematic diagram of the main structure of the movable mold body of the upper shell mold of the utility model.

[0039] Fig.14 It is a schematic cross-sectional structure diagram of the movable mold body of the upper shell mold of the utility model.

[0040] Fig.15 It is a schematic structural diagram of an isometric side view of a movable die body of an upper shell mold of the utility model.

[0041] Fig.16 It is an isometric side structural schematic diagram of the lower mold shell of the utility model.

[0042] Fig.17 It is an isometric side structural schematic diagram of the upper shell of the utility model.

[0043] Fig.18 It is a three-dimensional structural schematic diagram of the upper shell of the utility model.

[0044] In the figure: 101, first fixed mold body; 102, first movable mold body; 103, planet carrier model; 104, gate nest; 105, gate; 106, groove; 107, first mold cavity; 108, first sand shooting port; 109, first positioning hole; 110, first positioning pin; 111, first heating pipe hole; 112, first temperature measuring hole; 113, second heating pipe hole; 114, first mounting flange; 115, first mounting mounting hole; 116, second mounting flange; 117, second mounting hole; 118, first top plate; 119, first ejection spring; 120, first reset ejector pin; 121, first mold shell ejector pin; 122, second top plate; 123, second reset ejector pin; 124, second mold shell ejector pin; 125, first threaded hole for hoisting; 126, second threaded hole for hoisting; 201, second fixed mold body; 202, second movable mold body; 20 3. Self-core groove; 204, sprue; 205, riser neck; 206, riser; 207, pouring cup; 208, second sand shooting port; 209, second mold cavity; 210, second positioning groove; 211, second positioning hole; 212, second positioning pin; 213, third heating tube hole; 214, second temperature measuring hole; 215, fourth heating tube hole; 216, third mounting flange; 217, third mounting hole; 218, third Four mounting flanges; 219, fourth mounting holes; 220, third top plate; 221, second ejector spring; 222, third reset ejector pin; 223, third shell ejector pin; 224, fourth top plate; 225, fourth reset ejector pin; 226, fourth shell ejector pin; 227, third threaded hole for hoisting; 228, fourth threaded hole for hoisting; 3, lower shell; 301, first positioning groove; 4, upper shell; 401, positioning boss. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0046] Example 1

[0047] A coated sand shell mold for planet carrier casting, characterized in that:

[0048] It includes a lower shell mold and an upper shell mold that cooperate with each other;

[0049] The lower shell mold comprises a first fixed mold body 101 and a first movable mold body 102. The first fixed mold body 101 has a planet carrier model 103, a gate nest 104, a gate 105, and a groove 106. The first movable mold body 102 has a first mold cavity 107 and a first sand shooting port 108 that are similar in shape to the planet carrier mold 103 and 10 to 20 mm larger in size.

[0050] The upper shell mold comprises a second fixed mold body 201 and a second movable mold body 202. The second fixed mold body 201 has a self-core groove 203, a sprue 204, and a riser neck 205 matching the planet carrier model 103; the second movable mold body 202 has a riser 206, a pouring cup 207, a second sand-shooting port 208, and a second mold cavity 209 with a shape similar to the riser 206 and the pouring cup 207 and a size 10 to 20 mm larger;

[0051] The planet carrier model 103 and the self-core groove 203 each have two;

[0052] The upper shell mold corresponding to each planet carrier model 103 is provided with two riser necks 205 and risers 206, and each two riser necks 205 and risers 206 respectively form two risers to compensate for the shrinkage of one planet carrier casting;

[0053] A gate nest 104, a gate 105, a sprue 204, and a sprue cup 207 are provided between the two planet carrier models 103, and the gate nest 104, the gate 105, the sprue 204, and the sprue cup 207 constitute a pouring system;

[0054] The outermost edge size of the first mold cavity 107 of the first movable mold body 102 is larger than the outermost edge size of the groove 106 of the first fixed mold body 101, and the two can form a positioning groove 301 for the lower mold shell 3; the second fixed mold body 201 has a second positioning groove 210, which can form a positioning boss 401 of the upper mold shell 4 that matches the positioning groove 301 of the lower mold shell 3 with the second movable mold body 202.

[0055] like Figure 1 , Figure 2 The planet carrier shown is made of ZG40Cr. The product is produced in large quantities and has high requirements for surface finish and dimensional accuracy. Figure 3 As shown, the large end face of the casting faces upward, and a self-core is used in the groove; two risers are set to compensate for shrinkage, and the riser adopts a neck design to reduce the heat node at the contact between the casting and the riser; a riser neck is set at the root of the riser to facilitate riser cutting; "one mold and two pieces" is adopted, and a gate nest is set below the sprue. The molten steel flows into the gate nest and then is divided, and two castings are poured at the same time; for the convenience of pouring, a pouring cup is set above the sprue.

[0056] A coated sand shell mold for planetary carrier casting, which can be used in conjunction with a double-station vertical core shooting machine to produce high-precision Figure 1 , Figure 2 The planet carrier shown in the figure, the specific structure and working principle of the mold are described in detail below.

[0057] The mold consists of a lower shell mold and an upper shell mold that cooperate with each other.

[0058] Among them, Figures 4 to 10 As shown, the lower shell mold includes the steps of using the lower shell mold of this embodiment to make the lower shell 3:

[0059] 1. Screw two lifting rings with external threads into the first threaded hole 125 for lifting of the first fixed mold body 101 and the second threaded hole 126 for lifting of the first movable mold body 102, respectively, lift the lower shell mold to one of the installation positions of the double-station vertical core shooting machine, install the first fixed mold body 101 on the fixed plate of the core shooting machine through the first mounting hole 115 on the first mounting flange 114, and install the first movable mold body 102 on the movable push plate of the core shooting machine through the second mounting hole 117 on the second mounting flange 116, and then remove the two lifting rings respectively;

[0060] 2. After checking that the first fixed mold body 101 and the first movable mold body 102 are accurately positioned and can be opened and closed normally, insert the resistive heating tube into the first heating tube hole 111 of the first fixed mold body 101 and the second heating tube hole 113 of the first movable mold body 102 respectively, and insert the temperature measuring thermocouple into the first temperature measuring hole 112 of the first fixed mold body 101;

[0061] 3. Set the core shooting machine operating parameters, including sand shooting time, heating temperature, and heating time;

[0062] 4. After checking that the installation is correct, press the core shooter operation button and the core shooter starts to heat the mold; when the temperature is heated to the set value, the core making indicator light turns on, indicating that the shell making operation can be carried out;

[0063] 5. Spray the mold release agent to the mold cavity, press the core shooting machine core button, and the core shooting machine movable push plate pushes the first movable mold body 102 to close the mold with the first fixed mold body 101. The first positioning hole 109 and the first positioning pin 110 ensure accurate positioning. Under the action of the first reset ejector 120 and the second reset ejector 123, the first ejector plate 118, the first mold shell ejector 121, the second ejector plate 122, and the second mold shell ejector 124 are in the correct position. At this time, the ejection first spring 119 is in a compressed state.

[0064] 6. The sand shooting head of the core shooting machine is aligned with the first sand shooting port 108 and pressed downward to shoot the coated sand into the mold cavity. After completion, it is lifted up and separated from the mold;

[0065] 7. The coated sand in the mold cavity hardens into the lower mold shell 3 within the set heating time. When the set heating time is reached, the movable push plate of the core shooting machine automatically opens the mold, pulling the first movable mold body 102 and the first fixed mold body 101 apart. At this time, the first ejector spring 119 releases its elastic force due to the mold opening, pushing the first ejector plate 118, prompting the first mold shell ejector rod 121 to push the lower mold shell 3 toward the movement direction of the first movable mold body 102. On the other hand, the lower mold shell 3 is pushed by the first movable mold body 102. The lower mold shell 3 is pulled by the demoulding resistance of the cavity. Under the action of "one push and one pull", the lower mold shell 3 is separated from the first fixed mold body 101 first, and remains in the mold cavity of the first movable mold body 102, and moves with it until the second top plate 122 contacts the ejection mechanism of the core shooting machine and stops, but the first movable mold body 102 continues to move to the end of the stroke before stopping. The second mold shell ejector rod 124 ejects the lower mold shell 3 out of the mold cavity of the first movable mold body 102, completing the automatic demoulding, taking away the lower mold shell, and completing the shell making operation in one piece;

[0066] 8. Use compressed air to clean the cavity of the lower shell mold and spray the release agent before proceeding to the next shell making operation.

[0067] like Fig.16 The lower shell 3 shown, Fig.17 After the upper shell 4 is manufactured, it is cooled to room temperature and can be directly used for pouring after the mold is closed without the need for painting. Before closing the mold, blow away the floating sand, then apply a circle of core adhesive to the positioning groove 301 of the lower shell 3, close the upper shell 4, and make its positioning boss 401 completely fit with the positioning groove 301 of the lower shell 3. After the core adhesive hardens, pouring can be carried out. The mold closing result is shown in FIG. Fig.18 shown.

[0068] It is worth mentioning that, in this embodiment:

[0069] 1. The double-station vertical core shooter and the matching precision hot core box mold are used to realize mechanized casting production using coated sand technology. The core shooter can install and operate the lower shell mold and the upper shell mold at the same time, and can realize the "one mold, two pieces" casting method. It has the advantages of high production efficiency, high casting size accuracy, high surface finish, etc., and there are fewer production processes, fewer factors affecting product quality, and stable product quality;

[0070] 2. The mold shell is used for casting production. According to calculations, only 0.65 kg of coated sand is needed to produce 1 kg of castings. The consumption of coated sand is low, and the mold shell does not need to be painted and can be directly provided for pouring, which saves paint consumption, reduces production processes, shortens production time, and reduces production costs;

[0071] 3. The double-station vertical core shooting machine and the matching precision hot core box mold can be used to install and operate the lower shell mold and the upper shell mold at the same time. The lower shell and the upper shell manufactured at the same time can be directly combined for casting, and the production cycle is short.

[0072] In summary, the coated sand shell mold for planetary carrier casting of this embodiment is aimed at Figure 1 , Figure 2 The structure of the planetary carrier shown realizes the casting production using the coated sand process, and has the advantages of high production efficiency, low cost, high casting size accuracy, and high surface finish.

[0073] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A coated sand shell mold for planetary carrier casting, characterized in that: It includes a lower shell mold and an upper shell mold that cooperate with each other; The lower shell mold comprises a first fixed mold body (101) and a first movable mold body (102); the first fixed mold body (101) is provided with a planet carrier model (103), a gate nest (104), a gate (105), and a groove (106); the first movable mold body (102) is provided with a first mold cavity (107) and a first sand-shooting port (108) which is similar in shape to the planet carrier model (103) and 10 to 20 mm larger in size; The upper shell mold comprises a second fixed mold body (201) and a second movable mold body (202); the second fixed mold body (201) is provided with a self-core groove (203) matching the planetary carrier model (103), a sprue (204), and a riser neck (205); the second movable mold body (202) is provided with a riser (206), a pouring cup (207), a second sand-shooting port (208), and a second mold cavity (209) having a shape similar to that of the riser (206) and the pouring cup (207) and having a size 10 to 20 mm larger; The planet carrier model (103) and the self-core groove (203) each have two; The upper shell mold corresponding to each planet carrier model (103) is provided with two riser necks (205) and risers (206), and each two riser necks (205) and risers (206) respectively form two risers to compensate for the shrinkage of a planet carrier casting; A gate nest (104), a gate (105), a sprue (204), and a gate cup (207) are provided between the two planet carrier models (103); the gate nest (104), the gate (105), the sprue (204), and the gate cup (207) constitute a pouring system; The outermost edge size of the first mold cavity (107) of the first movable mold body (102) is larger than the outermost edge size of the groove (106) of the first fixed mold body (101), and the two can form a first positioning groove (301) of the lower mold shell (3); the second fixed mold body (201) has a second positioning groove (210), which can form a positioning boss (401) of the upper mold shell (4) that matches the first positioning groove (301) of the lower mold shell (3) with the second movable mold body (202).

2. The coated sand shell mold for planetary carrier casting according to claim 1, characterized in that: The first fixed mold body (101) is provided with a first positioning hole (109); and the first movable mold body (102) is provided with a first positioning pin (110) matching the first positioning hole (109).

3. The coated sand shell mold for planetary carrier casting according to claim 1, characterized in that: The first fixed mold body (101) is provided with a first heating tube hole (111) penetrating the main body, and a first temperature measuring hole (112) is provided on the side; the first movable mold body (102) is provided with a second heating tube hole (113) penetrating the main body.

4. The coated sand shell mold for planetary carrier casting according to claim 1, characterized in that: The first fixed mold body (101) is provided with a first mounting flange (114), and the first mounting flange (114) is provided with a first mounting hole (115); the first movable mold body (102) is provided with a second mounting flange (116), and the second mounting flange (116) is provided with a second mounting hole (117).

5. The coated sand shell mold for planetary carrier casting according to claim 1, characterized in that: The first fixed mold body (101) is provided with a first top plate (118) and a first ejecting spring (119), and the first top plate (118) is provided with a first reset ejector rod (120) and a first mold shell ejector rod (121); the first movable mold body (102) is provided with a second top plate (122), and the second top plate (122) is provided with a second reset ejector rod (123) and a second mold shell ejector rod (124).

6. The coated sand shell mold for planetary carrier casting according to claim 1, characterized in that: The second fixed mold body (201) is provided with a second positioning hole (211); and the second movable mold body (202) is provided with a second positioning pin (212) matching the second positioning hole (211).

7. The coated sand shell mold for planetary carrier casting according to claim 1, characterized in that: The second fixed mold body (201) is provided with a third heating tube hole (213) penetrating the main body, and a second temperature measuring hole (214) is provided on the side; the second movable mold body (202) is provided with a fourth heating tube hole (215) penetrating the main body.

8. The coated sand shell mold for planet carrier casting according to claim 1, characterized in that: The second fixed mold body (201) is provided with a third mounting flange (216), and the third mounting flange (216) is provided with a third mounting hole (217); the second movable mold body (202) is provided with a fourth mounting flange (218), and the fourth mounting flange (218) is provided with a fourth mounting hole (219).

9. The coated sand shell mold for planetary carrier casting according to claim 1, characterized in that: The second fixed mold body (201) is provided with a third top plate (220) and a second ejecting spring (221), and the third top plate (220) is provided with a third reset ejector rod (222) and a third mold shell ejector rod (223); the second movable mold body (202) is provided with a fourth top plate (224), and the fourth top plate (224) is provided with a fourth reset ejector rod (225) and a fourth mold shell ejector rod (226).

10. The coated sand shell mold for planet carrier casting according to claim 1, characterized in that: A first threaded hole (125) for hoisting is provided on the top of the first fixed mold body (101); a second threaded hole (126) for hoisting is provided on the top of the first movable mold body (102); a third threaded hole (227) for hoisting is provided on the top of the second fixed mold body (201); and a fourth threaded hole (228) for hoisting is provided on the top of the second movable mold body (202).

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