A plate spring lower support coated sand shell mold and a preparation method thereof

Abstract

The application relates to the casting technical field, in particular to a coated sand shell mold for a plate spring lower support and a preparation method thereof, which comprises a first mold group and a second mold group, the first mold group is provided with a first half-shell mold cavity, a first sand core cavity and a shunt cavity; the shunt cavity is located above the first sand core cavity, the shunt cavity is internally provided with a first shunt module and a second shunt module; the first sand core cavity is communicated with the shunt cavity through a second sand runner; the shunt cavity is communicated with a U-shaped connecting seat part of the first half-shell mold cavity through a first sand runner, and the thickness of the bottom of the U-shaped connecting seat of the first half-shell mold cavity is 1.2-2 times that of the bottom of the U-shaped connecting seat of the plate spring lower support casting. The application guarantees the quality of the sand shell mold of the plate spring lower support, and provides a method for preparing the plate spring lower support by adopting the coated sand process, so that the quality of the plate spring lower support casting is effectively guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of casting, in particular to a laminated spring lower support coated sand shell mold and a preparation method thereof. BACKGROUND

[0002] In the industrial field of automobile manufacturing, the lower support of the laminated spring is a key load-bearing component connecting the frame and the laminated spring. Its structure needs to adapt to complex stress conditions, so it has strict requirements on the contour accuracy, wall thickness uniformity and internal density of the blank. The preparation quality of the coated sand shell directly determines the performance of the finished product. Therefore, the rationality of the mold design is particularly important. With the continuous progress of industrial technology, the manufacturing precision, structural complexity and production efficiency of the laminated spring lower support have been put forward more stringent requirements. Under this background, the coated sand process has been widely used in the preparation of the laminated spring lower support due to its many advantages.

[0003] When preparing the coated sand shell of the laminated spring lower support using the coated sand process, due to the special structure of the laminated spring lower support, it contains a 7-shaped connecting arm and a U-shaped connecting seat connected to each other. When using coated sand casting, it is often difficult to uniformly and fully fill each part of the mold cavity due to the existence of deep cavity, narrow gap, multiple special-shaped corners and other structures, thus bringing great challenges to the sand shooting and filling process of the laminated spring lower support. The traditional coated sand filling process is prone to cause defects such as sand shortage and loose in the shell, which seriously affects the quality of the shell and further reduces the quality and performance of the laminated spring lower support casting, and increases the scrap rate. SUMMARY

[0004] The present application aims to solve the problems of the prior art. A laminated spring lower support coated sand shell mold and a preparation method thereof are provided, which solve the problem of shell filling defects caused by the special structure of the laminated spring lower support when using coated sand casting, effectively ensuring the casting precision of the laminated spring lower support.

[0005] The technical solution adopted by the present application to solve the technical problems is: a laminated spring lower support coated sand shell mold, comprising a first mold group and a second mold group,

[0006] The first mold group is provided with a first half shell mold cavity, a first sand core cavity and a shunt cavity, and a sand shooting port A and a sand shooting port B are respectively arranged above the first half shell mold cavity and the shunt cavity;

[0007] The shunt cavity is located above the first sand core cavity, and the shunt cavity is internally provided with a first shunt module and a second shunt module for separating the shunt cavity;

[0008] The first sand core cavity is located outside the first half shell mold cavity, and the first sand core cavity is communicated with the shunt cavity through a second sand flow channel.

[0009] The first half shell cavity is used for forming a first half shell, and the distribution cavity is communicated with the U-shaped connecting seat part of the first half shell cavity through the first sand runner.

[0010] The second mold set is provided with a second half shell cavity for forming a second half shell.

[0011] Further, the first mold set is provided with a plurality of first half shell cavities, and a first sprue cavity is arranged between adjacent two first half shell cavities.

[0012] Further, the sand injection port A is located at one end of the first half shell cavity close to the 7-shaped arm.

[0013] Further, gaps are arranged between the first distribution module, the second distribution module and the distribution cavity, and the gap between the first distribution module and the second distribution module is V-shaped.

[0014] Further, the first sand runner is vertically arranged, the second sand runner is arc-shaped, and the inlet end of the second sand runner is communicated with the inlet end of the first sand runner.

[0015] Further, the first distribution module is located close to one side of the first sand core cavity, the second distribution module is located close to one side of the first half shell cavity, and the gap formed between the second distribution module and the distribution cavity is Z-shaped.

[0016] Further, the second mold set is also provided with a second sand core cavity, the sand injection port C of the second mold set is located at one end of the U-shaped connecting seat of the second half shell cavity, the second sand core cavity is located outside the second half shell cavity of the second mold set, the sand injection port C is communicated with the second sand core cavity through a third sand runner, the outlet of the third sand runner is located above the second sand core cavity, the inlet end of the third sand runner is communicated with the U-shaped connecting seat part of the second half shell cavity, and the width of the third sand runner gradually increases along the sand injection direction.

[0017] Further, one corner of the second sand core cavity is provided with a second positioning groove, the first half shell cavity is provided with a first positioning groove, and the first positioning groove is correspondingly arranged with the second positioning groove.

[0018] On the other hand, a preparation method of a laminated sand shell of a lower support of a leaf spring, comprising the following steps:

[0019] S1, using the first mold set to prepare a first half shell mold and a first sand core, and placing the first sand core in a sand core cavity on the side of the U-shaped connecting seat of the first half shell mold;

[0020] S2, placing the prepared second sand core in the U-shaped connecting seat cavity of the first half shell mold, one end of the second sand core being matched with the first half shell mold and the other end being matched with the first sand core;

[0021] S3, clamping and fixing the prepared second half shell mold with the first half shell mold to obtain a sand shell mold of the lower support of the leaf spring.

[0022] The beneficial effects of the present application are: the present application thickens the cavity position at the bottom of the U-shaped connecting seat of the lower support of the leaf spring in the first mold set, and the outlet of the first sand flow channel is communicated with the U-shaped connecting seat part, which is beneficial to increasing the size of the cross section of the outlet of the first sand flow channel, can provide sufficient smooth flow channel for the sand mold of the U-shaped connecting seat structure of the lower support of the leaf spring, so as to ensure that the sand mold of the first half shell mold is uniformly and completely filled, and casting defects caused by insufficient filling of the first half shell mold are avoided. On the other hand, the positioning boss formed at one end of the second sand core is matched with the first half shell mold, and the other end is matched with the first sand core, so as to realize the positioning and fixing of the first sand core in the first half shell mold, and the precision of the size of the casting is ensured. The present application increases the thickness of the cavity at the bottom of the U-shaped connecting seat, and simultaneously fixes and positions the second sand core and the first sand core through the cooperation of the second sand core and the first sand core, to form a sand mold system for casting the lower support of the leaf spring, so as to ensure the precision of the size of the casting. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structure schematic view of the first mold set of the present application.

[0024] Figure 2 is a structure schematic view of the first mold A of the present application.

[0025] Figure 3 is Figure 2 an enlarged view of the local structure A.

[0026] Figure 4 is Figure 2 the front view.

[0027] Figure 5 is Figure 4 an enlarged view of the local structure B of

[0028] Figure 6 is a structure schematic view of the first mold B of the first mold set of the present application.

[0029] Figure 7 is Figure 6 the front view.

[0030] Figure 8is a structural schematic diagram of a second module of the present application.

[0031] Figure 9 is Figure 8 an enlarged view of a partial structure C of the present application.

[0032] Figure 10 is Figure 1 a sectional view along the A-A direction.

[0033] Figure 11 is a schematic diagram of the first sand core and the second sand core matched with the first half shell mold.

[0034] Figure 12 is Figure 11 a front view of the present application.

[0035] Figure 13 is Figure 12 a partial structure schematic diagram along the D direction.

[0036] Explanation of reference signs:

[0037] 10 - first module, 101 - first half shell mold cavity, 102 - first sand core cavity, 103 - split flow cavity, 104 - sand shooting port A, 105 - sand shooting port B, 106 - first split flow module, 107 - second split flow module, 108 - second sand flow channel, 109 - first sand flow channel, 110 - first gate cavity, 111 - first positioning groove, 112 - sand core cavity, 113 - first sand core, 20 - second module, 201 - second half shell mold cavity, 202 - second sand core cavity, 203 - sand shooting port C, 204 - third sand flow channel, 205 - second positioning groove, 206 - positioning protrusion, 207 - second sand core, 301 - 7-shaped connecting arm, 302 - U-shaped connecting seat, 303 - bottom of U-shaped connecting seat, 4 - positioning unit. DETAILED DESCRIPTION

[0038] The present application will be further described in conjunction with the drawings and specific embodiments, which are not intended to limit the scope of the present application.

[0039] It should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0040] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0041] As shown in Figures 1-13 The plate spring lower support coated sand shell mold of the embodiment comprises a first mold group 10 and a second mold group 20,

[0042] The first mold group 10 comprises a first mold A and a first mold B, that is, the first mold A and the first mold B form the first mold group 10 after clamping, the first mold group 10 is provided with a first half shell cavity 101, a first sand core cavity 102 and a shunt cavity 103, and the first half shell cavity 101 and the shunt cavity 103 are respectively provided with a sand shooting port A 104 and a sand shooting port B 105 above; the first half shell cavity 101 comprises a cavity at the part of the 7-shaped connecting arm 301 and the U-shaped connecting seat 302, that is, the parting surface of the first half shell and the second half shell is located at the side wall of the plate spring lower support;

[0043] The shunt cavity 103 is located above the first sand core cavity 102, the shunt cavity 103 is provided with a first shunt module 106 and a second shunt module 107 inside the shunt cavity 103 for separating the shunt cavity 103, and the first shunt module 106 and the second shunt module 107 are arranged in the horizontal direction; during sand shooting, the shunt cavity 103 and the first shunt module 106 and the second shunt module 107 can shunt the coated sand, control the sand amount of the first sand runner 109 and the second sand runner 108, so that the first sand core cavity 102 and the first half shell cavity 101 realize simultaneous filling;

[0044] The first sand core cavity 102 is located outside the first half shell cavity 101 and is used for forming a first sand core, the first sand core is used for forming a blind hole on the side of the U-shaped connecting seat of the plate spring lower support casting, so as to facilitate guaranteeing the machining precision of the subsequent connecting hole; the first sand core cavity 102 is communicated with the shunt cavity 103 through the second sand runner 108; the present application guarantees the simultaneous filling of the first half shell and the first sand core by arranging the first half shell cavity 101 and the first sand core cavity 102 in the first mold group 10 and arranging the sand shooting port and the shunt cavity 103, improves the production efficiency, and reduces the mold opening cost of the sand core mold;

[0045] The first half shell cavity 101 is used for forming a first half shell, and a U-shaped connecting seat side plate of the first half shell is vertically arranged in the first half shell cavity 101. The distribution cavity 103 is communicated with the U-shaped connecting seat part of the first half shell cavity 101 through the first sand runner 109. The bottom thickness of the U-shaped connecting seat of the first half shell cavity 101 is 1.2-2 times the thickness of the lower support of the leaf spring casting. Preferably, the outlet end of the first sand runner 109 is communicated with the bottom 303 of the U-shaped connecting seat of the first half sand shell cavity, and the outlet of the first sand runner 109 extends from above the bottom 303 of the U-shaped connecting seat to below the bottom 303 of the U-shaped connecting seat, that is, the outlet of the first sand runner 109 is inclined, and the outlet of the first sand runner 109 is not perpendicular to the axis of the first sand runner 109. The U-shaped clamping bottom refers to the connection between the U-shaped clamping of the lower support of the leaf spring and the 7-shaped connecting arm 301. The thickness of the U-shaped clamping bottom cavity is increased to increase the size of the outlet cross section of the first sand runner 109, so that the filling of the U-shaped structure sand mold of the U-shaped connecting seat 302 is effectively ensured, and then the filling of the sand mold at all positions of the first half shell cavity 101 is ensured, and the first half shell cavity 101 and the first sand core cavity 102 can be simultaneously filled during the distribution of the coated sand in the distribution cavity 103, so that the shell forming defects such as sand shortage and cavity are avoided.

[0046] The second mold group 20 is used for forming a second half shell, and the first half shell and the second half shell form a sand shell of the lower support of the leaf spring after being combined.

[0047] The first mold group 10 is provided with a plurality of first half shell cavities 101, and a first runner cavity 110 is arranged between adjacent two first half shell cavities 101 to form a pouring gate. The number of the distribution cavities 103 and the first sand core cavities 102 corresponds to the first half shell cavities 101.

[0048] As shown in Figure 1 , the sand injection port A 104 is located at one end of the first half shell cavity 101 close to the 7-shaped arm. The flow direction of the coated sand in the first half shell cavity 101 is from one end of the 7-shaped arm to one end of the U-shaped connecting seat 302. When the sand is injected into the first half shell cavity 101 and the first sand core cavity 102 through the sand injection ports A 104 and B 105 under the action of the distribution cavity 103, the filling of the cavities is ensured at the same time.

[0049] As shown in Figure 1 , gaps are arranged between the first distribution module 106, the second distribution module 107, and the distribution cavity 103, and between the top, bottom, and two side walls of the first distribution module 106, the second distribution module 107, and the distribution cavity 103. Gaps are also arranged between the first distribution module 106 and the second distribution module 107. Figure 10As shown, along the horizontal direction, i.e., along the direction perpendicular to the sand-shooting direction, the gap between the first diversion module 106 and the second diversion module 107 is V-shaped; as Figures 1-9 As shown, the first diversion module 106 and the second diversion module 107 are located below the sand injection port B105, and the inlet of the first sand flow channel 109 is located below the gap between the first diversion module 106 and the second diversion module 107. The diversion cavity 103 in the first diversion module 106 and the second diversion module 107, as well as the position of the sand injection port B105 and the inlet of the first sand flow channel 109, facilitate the diversion of the coated sand injected into the sand injection port B105. Thus, when sand is injected simultaneously from the sand injection port A104 and the sand injection port B105, the first half-shell cavity 101 and the first sand core cavity 102 are filled simultaneously.

[0050] like Figure 1 , 4 As shown in Figure 7, the first sand flow channel 109 is vertically arranged, and the second sand flow channel 108 is arc-shaped. The inlet end of the second sand flow channel 108 is connected to the inlet end of the first sand flow channel 109. Under the diversion action of the diversion cavity 103, the first diversion module 106 and the second diversion module 107, the connection between the inlet ends of the first sand flow channel 109 and the second sand flow channel 108 further ensures the diversion flow of the coated sand, so that the coated sand enters the first half-shell cavity 101 and the first sand core cavity 102 through the first sand flow channel 109 and the second sand flow channel 108 respectively, ensuring that the first sand core cavity 102 and the first half-shell cavity are filled and filled, avoiding shell quality problems caused by inconsistent cavity filling.

[0051] like Figures 1-2 As shown, the first diversion module 106 is located near the first sand core cavity 102, and the second diversion module 107 is located near the first half-shell cavity 101, as... Figure 10 As shown, the gap formed between the second diversion module 107 and the diversion cavity 103 is Z-shaped, which ensures a stable flow rate and pressure during the diversion of coated sand, controls the flow rate or velocity of coated sand in the first sand channel 109 and the second sand channel 108, and provides a guarantee for the filling of the U-shaped connecting seat 302 structure and the filling of the first half-shell cavity 101.

[0052] like Figure 8As shown, the second mold 20 is also provided with a second sand core cavity 202, and the sand shooting opening C203 of the second mold 20 is located at one end of the U-shaped connecting seat 302 of the second half shell mold cavity 201, the second sand core cavity 202 is located outside the second half shell mold cavity 201 of the second mold 20, the sand shooting opening C203 is communicated with the second sand core cavity 202 through a third sand flow channel 204, the outlet of the third sand flow channel 204 is located above the second sand core cavity 202, and the inlet end of the third sand flow channel 204 is communicated with the U-shaped connecting seat part of the second half shell mold cavity 201. In the sand shooting direction, the width of the third sand flow channel 204 gradually increases.

[0053] As shown, the second sand core cavity 202 is provided with a second positioning groove 205, and when the second sand core is prepared, the second positioning groove 205 can form a positioning protrusion 206, such as Figure 2 and Figure 3 As shown, the first half shell mold cavity 101 is provided with a first positioning groove 111, and the first positioning groove 111 is correspondingly provided with the second positioning groove. When the mold is closed, the positioning protrusion 206 formed by the second sand core 207 is matched with the first positioning groove 111 of the first half shell mold cavity 101, so that the second sand core 207 is clamped and positioned and fixed in the first half shell, so that the casting with the required thickness of the cavity can be easily casted. In addition, the first sand core cavity 202 and the first sand core cavity 102 are provided with a positioning unit 4 for forming a hole or a positioning column in the first sand core and the second sand core. Through the cooperation of the positioning column and the groove hole between the first sand core and the second sand core, the positioning and fixing of the first sand core can be strengthened, which is beneficial to guarantee the precision of the size of the casting. The second sand core is used to guarantee the thickness of the U-shaped connecting seat 302 of the plate spring lower support casting, and to position and fix the first sand core, so as to form a sand core system of the plate spring lower support sand shell with the first sand core, thereby guaranteeing the precision of the plate spring lower support.

[0054] A preparation method of a coated sand shell mold of a plate spring lower support, comprising the following steps:

[0055] S1, a first mold 10 is used to prepare a first half shell mold and a first sand core, the thickness of the U-shaped connecting seat bottom 303 of the first half shell mold is greater than that of the U-shaped connecting seat bottom 303 of the plate spring lower support casting, a sand core cavity 112 for placing a sand core is formed outside the U-shaped connecting seat 302 of the first half shell mold, and the first sand core or the first sand core and other sand cores are placed in the sand core cavity;

[0056] S2, the prepared second sand core is placed in the U-shaped connecting seat 302 cavity of the first half shell mold, the positioning protrusion at one end of the second sand core is matched with the cavity of the first half shell mold, and the other end is matched with the slot hole or positioning column of the first sand core, so that the cooperation of the first sand core, the first half shell mold and the second sand core realizes the fixation of the sand core system, and is beneficial to guarantee the positioning accuracy of the first sand core, thereby guaranteeing the precision of the size of the castings after casting;

[0057] S3, the second half shell mold is closed with the first half shell mold and is connected and fixed, and the sand shell of the plate spring lower support is obtained, wherein the first runner cavity 110 forms a first runner, and during casting, the metal liquid is poured into the sand shell from the first runner between the two sand shells.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not limited to the protection scope of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present application.

Claims

1. A plate spring lower support coated sand shell mold characterized by: The first mold group (10) and the second mold group (20) are provided, The first mold group (10) is provided with a first half-shell cavity (101), a first sand core cavity (102), and a shunt cavity (103), and the first half-shell cavity (101) and the shunt cavity (103) are respectively provided with a sand shooting port A (104) and a sand shooting port B (105) above. The shunt cavity (103) is located above the first sand core cavity (102), and the shunt cavity (103) is provided with a first shunt module (106) and a second shunt module (107) inside the shunt cavity (103) for separating the shunt cavity (103); a gap is provided between the first shunt module (106), the second shunt module (107), and the shunt cavity (103), and the gap between the first shunt module (106) and the second shunt module (107) is V-shaped. The first sand core cavity (102) is located outside the first half-shell cavity (101), and the first sand core cavity (102) is communicated with the shunt cavity (103) through a second sand flow channel (108). The first half-shell cavity (101) is used for forming a first half-shell, the shunt cavity (103) is communicated with a U-shaped connecting seat part of the first half-shell cavity (101) through a first sand flow channel (109), an outlet end of the first sand flow channel (109) is communicated with a U-shaped connecting seat bottom (303) of the first half-shell cavity, and the first sand flow channel (109) extends from above the U-shaped connecting seat bottom (303) to below the U-shaped connecting seat bottom (303); and the thickness of the U-shaped connecting seat bottom of the first half-shell cavity (101) is 1.2-2 times the thickness of the U-shaped connecting seat bottom of the plate spring lower support casting. The second mold group (20) is provided with a second half-shell cavity (201).

2. A floor sand shell mold with a leaf spring lower seat according to claim 1, characterized in that: The first mold group (10) is provided with a plurality of first half-shell cavities (101), and a first runner cavity (110) is arranged between two adjacent first half-shell cavities (101).

3. A plate spring lower shoe coated sand shell mold according to claim 1, characterized in that: The sand shooting port A (104) is located at one end of the first half-shell cavity (101) close to a 7-shaped arm.

4. A floorboard spring lower bearing coated sand shell mold according to claim 1, characterized in that: The first sand flow channel (109) is vertically arranged, the second sand flow channel (108) is arc-shaped, and the inlet end of the second sand flow channel (108) is communicated with the inlet end of the first sand flow channel (109).

5. A floorboard spring lower bearing coated sand shell mold according to claim 1, characterized in that: The first shunt module (106) is located close to one side of the first sand core cavity (102), the second shunt module (107) is located close to one side of the first half-shell cavity (101), and a gap formed between the second shunt module (107) and the shunt cavity (103) is Z-shaped.

6. A floorboard spring lower bearing coated sand shell mold according to claim 1, characterized in that: The second mold group (20) is further provided with a second sand core cavity (202), a sand shooting port C (203) of the second mold group (20) is located at one end of a U-shaped connecting seat of the second half-shell cavity (201), the second sand core cavity (202) is located outside the second half-shell cavity (201), and the sand shooting port C (203) is communicated with the second sand core cavity (202) through a third sand flow channel (204).

7. A floor sand shell mold of a flat spring lower support according to claim 6, wherein: The outlet of the third sand flow channel (204) is above the second sand core cavity (202), the inlet end of the third sand flow channel (204) is communicated with the U-shaped connecting seat part of the second half shell cavity (201), and the width of the third sand flow channel (204) gradually increases along the sand injection direction.

8. A floorboard spring lower bearing coated sand shell mold according to claim 6, characterized in that: One corner of the second sand core cavity (202) is provided with a second positioning groove (205), and the first half shell cavity (101) is provided with a first positioning groove (111), and the first positioning groove (111) is correspondingly arranged with the second positioning groove (205).

9. A method for producing a coated sand shell mold for a leaf spring lower bearing using the mold according to any one of claims 1 to 8, characterized in that, The method comprises the following steps, S1, a first half shell and a first sand core (113) are prepared by using a first mold set (10), and the first sand core (113) is arranged in a sand core cavity (112) on the side of the U-shaped connecting seat of the first half shell; S2, the prepared second sand core (207) is arranged in the U-shaped connecting seat cavity of the first half shell, one end of the second sand core (207) is matched with the first half shell, and the other end is matched with the first sand core (113); S3, the prepared second half shell is matched and fixed with the first half shell to obtain a sand shell mold of the lower support of the leaf spring.

Images