Road roller frame, road roller and manufacturing method of road roller frame

Abstract

The invention provides a road roller frame, a road roller and a manufacturing method of the road roller frame. The road roller frame comprises a road roller front frame and a road roller rear frame; a rear frame of the road roller; the road roller front frame and the road roller rear frame are connected through the connecting part; wherein the road roller front frame and the road roller rear frame are integrally formed parts which are integrally cast respectively. The road roller provided by the invention comprises the road roller frame. The manufacturing method provided by the invention comprises the following steps: preparing the front frame of the road roller and the rear frame of the road roller, wherein the front frame of the road roller and the rear frame of the road roller are integrally cast integrally formed parts by adopting a casting method; and connecting the front frame of the road roller with the rear frame of the road roller by adopting a connecting part. The road roller front frame and the road roller rear frame of the road roller frame are each of a weldless structure, so that the structural rigidity of the road roller frame is improved, and the reliability of the road roller frame is improved.

Description

Technical Field

[0001] The present disclosure relates to engineering machinery, and in particular to a roller frame, a roller, and a method for manufacturing the roller frame. Background Art

[0002] In the related art, when manufacturing a roller frame, a welding process is mainly used to form a front frame and a rear frame of the roller, and the front frame and the rear frame of the roller are then connected together through a connecting part. In the welding process, the basic shapes of the components of the front frame and the rear frame of the roller are first formed by cutting, and then these components are spliced ​​together as needed by welding.

[0003] Although the above welding process meets the production needs, there are problems such as low material utilization, large processing volume, numerous processes, and difficult to control welding quality. For example, factors such as the selection of welding parameters, the quality of welding materials, and the technical level of operators will have a direct impact on the welding quality. Therefore, the overall rigidity of the roller frame is usually difficult to guarantee, especially in the heat-affected zone of the weld. Due to changes in material properties, fatigue failure is prone to occur under long-term use, which will affect the durability and safety of the roller frame. In addition, in order to enhance the overall rigidity of the roller frame, it is necessary to design additional reinforcement structures, which will increase the weight of the roller frame.

[0004] In recent years, with the rapid development of new energy engineering machinery products, lightweight body has become a new trend in road roller vehicle design. However, the above welding process is difficult to meet the demand for lightweight. Summary of the invention

[0005] The purpose of the present disclosure is to provide a roller frame, a roller, and a method for manufacturing a roller frame, aiming to solve the problems of low material utilization, large processing volume, numerous processes, and difficult control of welding quality in manufacturing the roller frame using a welding process, thereby reducing the durability and safety of the roller frame.

[0006] A first aspect of the present disclosure provides a road roller frame, comprising:

[0007] Front frame of road roller;

[0008] Road roller rear frame; and

[0009] A connecting portion, through which the front frame of the road roller and the rear frame of the road roller are connected;

[0010] The front frame of the road roller and the rear frame of the road roller are integrally cast one-piece components.

[0011] In some embodiments of the roller frame, the roller front frame includes:

[0012] A front frame support body configured to support the cab and connect the connecting portion;

[0013] A front frame side protection part, comprising a front frame left side protection part and a front frame right side protection part, wherein the front frame support body is connected between the front frame left side protection part and the front frame right side protection part; and

[0014] The water tank mounting seat is located at the rear of the lower part of the front frame support body, and includes a left water tank mounting part and a right water tank mounting part. The left water tank mounting part is located between the left side guard of the front frame and the front frame support body, and the right water tank mounting part is located between the right side guard of the front frame and the front frame support body.

[0015] In some embodiments of the road roller frame, the front frame support body includes:

[0016] A transverse support portion, the transverse support portion comprising a front support section and a rear support section, the front support section being fixedly connected to the left side guard of the front frame and the right side guard of the front frame, the rear support section being connected to the rear side of the front support section and being spaced apart from the left side guard of the front frame and the right side guard of the front frame;

[0017] A front cross beam of the support seat, comprising a left cross beam section and a right cross beam section arranged at intervals from each other in the left-right direction, wherein the left cross beam section is connected between the left side protection member of the front frame and the rear support section, and the right cross beam section is connected between the right side protection member of the front frame and the rear support section, and the left cross beam section and the right cross beam section respectively comprise front cross beam mounting holes for connecting with the cab;

[0018] a longitudinal support portion, located below the rear side of the lateral support portion, configured to connect the connection portion, the left water tank mounting portion connected between the left side guard of the front frame and the longitudinal support portion, and the right water tank mounting portion connected between the right side guard of the front frame and the longitudinal support portion; and

[0019] The rear cross beam of the support seat is spaced apart from the front cross beam of the support seat in the front-to-rear direction, connected between the rear end of the rear support section of the lateral support portion and the upper end of the longitudinal support portion, and the rear cross beam of the support seat includes a rear cross beam mounting hole for connecting with the cab.

[0020] In some embodiments of the roller frame,

[0021] The left side protection member of the front frame and the right side protection member of the front frame are hollow plates; and / or

[0022] The lateral support portion is a hollow plate; and / or

[0023] The longitudinal supporting portion is a hollow plate.

[0024] In some embodiments of the roller frame,

[0025] The front support segment includes a front support segment hollow hole; and / or

[0026] The rear support segment includes a rear support segment hollow hole.

[0027] In some embodiments of the roller frame, the front frame left side guard or the front frame right side guard includes at least one front frame guard hollow hole, and at least a portion of the edge shape of the at least one front frame guard hollow hole is consistent with the edge shape of the front frame left side guard or the front frame right side guard on the corresponding side.

[0028] In some embodiments of the roller frame, the longitudinal support part includes a front assembly part, which is located at the lower part of the longitudinal support part, and the front assembly part includes a front assembly part hollow hole and a plurality of first threaded holes, and the plurality of first threaded holes are arranged at intervals around the front assembly part hollow hole, and the plurality of first threaded holes are configured to be connected to the front end of the connecting part, the left water tank mounting part is connected between the left side guard of the front frame and the front assembly part, and the right water tank mounting part is connected between the right side guard of the front frame and the front assembly part.

[0029] In some embodiments of the roller frame,

[0030] The front cross beam of the support seat is configured in an L shape, including a transverse front cross beam plate and a longitudinal front cross beam plate, one end of the transverse front cross beam plate away from the longitudinal front cross beam plate is connected to the front frame side protection portion, the front cross beam mounting hole is provided on the transverse front cross beam plate, the top end of the longitudinal front cross beam plate is smoothly connected to one end of the rear support section of the transverse front cross beam plate close to the transverse support portion, and the bottom end of the longitudinal front cross beam plate is smoothly connected to the rear support section; and / or

[0031] The rear cross beam of the support seat includes a support plate with a groove-shaped cross section, the support plate includes a rear cross beam mounting plate, a rear cross beam front connecting plate connected to the lower side of the front end of the rear cross beam mounting plate, and a rear cross beam rear connecting plate connected to the lower side of the rear end of the rear cross beam mounting plate, the rear cross beam mounting hole is arranged on the rear cross beam mounting plate, the rear cross beam front connecting plate is smoothly connected to the rear end of the rear support section of the transverse support portion, and / or the rear cross beam rear connecting plate is smoothly connected to the top end of the longitudinal support portion; and / or

[0032] The left water tank mounting portion includes a U-shaped left water tank support, and the left water tank support includes a first free end and a second free end, the first free end is smoothly connected to the left side protection member of the front frame, and the second free end is smoothly connected to the left side of the lower part of the longitudinal support portion; and / or

[0033] The right water tank mounting portion includes a U-shaped right water tank support member, and the right water tank support member includes a third free end and a fourth free end. The third free end is smoothly connected to the right side guard of the front frame, and the fourth free end is smoothly connected to the right side of the lower part of the longitudinal support portion.

[0034] In some embodiments of the road roller frame, the road roller rear frame comprises:

[0035] Fan bracket;

[0036] A rear frame side protection part, comprising a rear frame left side protection part and a rear frame right side protection part, wherein the fan bracket is located between an upper portion of the rear frame left side protection part and an upper portion of the rear frame right side protection part; and

[0037] The rear frame bottom support portion is located between the lower portion of the rear frame left side guard and the lower portion of the rear frame right side guard, and is configured to connect the connection portion.

[0038] In some embodiments of the roller frame,

[0039] The fan bracket comprises a fan bracket main body and a fan bracket transverse support portion, wherein the fan bracket transverse support portion is connected to the rear side of the fan bracket main body, and the fan bracket transverse support portion is a hollow plate; and / or

[0040] The rear frame side protection portion is a hollow plate; and / or

[0041] The bottom support portion of the rear frame is a hollow plate.

[0042] In some embodiments of the roller frame, the rear frame left side guard or the rear frame right side guard includes at least one rear frame guard hollow hole, and at least a portion of the edge shape of the at least one rear frame guard hollow hole is consistent with the edge shape of the rear frame left side guard or the rear frame right side guard on the corresponding side.

[0043] In some embodiments of the roller frame, the rear frame bottom support portion includes a rear assembly portion, the rear assembly portion is located in the middle of the rear frame bottom support portion, the rear assembly portion includes a rear assembly portion hollow hole and a plurality of second threaded holes, the plurality of second threaded holes are arranged at intervals around the rear assembly portion hollow hole, and the plurality of second threaded holes are configured to be connected to the rear end of the connecting portion.

[0044] In some embodiments of the roller frame, the rear frame bottom support portion is configured in a U shape, including a fifth free end and a sixth free end, the fifth free end is smoothly connected to the front side of the lower part of the left side guard of the rear frame, and the sixth free end is smoothly connected to the front side of the lower part of the right side guard of the rear frame.

[0045] A second aspect of the present disclosure provides a road roller, comprising the road roller frame described in the first aspect of the present disclosure.

[0046] A third aspect of the present disclosure provides a method for manufacturing the roller frame according to the first aspect of the present disclosure, comprising:

[0047] Preparing the front frame and the rear frame of the road roller, comprising using a casting method to make the front frame and the rear frame of the road roller respectively integrally cast as one-piece molded parts; and

[0048] The connecting portion is used to connect the front frame of the road roller and the rear frame of the road roller.

[0049] In the manufacturing method of some embodiments, the casting method includes:

[0050] Step 10, forming a shell-type sand mold based on 3D printing technology, wherein the shell-type sand mold includes a sand mold surface consistent with the shape of the front frame of the road roller or the rear frame of the road roller, and the internal space of the shell-type sand mold is configured to include a molding space consistent with the shape of the front frame of the road roller or the rear frame of the road roller;

[0051] Step 30, placing the shell sand mold in a sand box, and pouring granules into the gap between the sand box and the shell sand mold;

[0052] Step 50, pouring molten metal into the shell sand mold to form a frame casting in the shell sand mold that is consistent with the shape of the front frame of the road roller or the rear frame of the road roller;

[0053] Step 70, after cooling the sand box and its interior, opening the sand box and taking out the combined structure of the shell sand mold and the frame casting blank; and

[0054] Step 90, cooling the combined structure, taking out the frame ingot, and performing surface processing on the frame ingot to obtain the integrally formed front frame or rear frame of the road roller.

[0055] In the manufacturing method of some embodiments, the step 30 further includes: vibrating the flask when pouring the granules into the gap between the flask and the shell sand mold.

[0056] In the manufacturing method of some embodiments, the step 30 further includes: adjusting the vibration frequency of the sand box so that the vibration frequency gradually increases.

[0057] In the manufacturing method of some embodiments, in step 10, the wall thickness of the shell sand mold is 20 mm to 100 mm.

[0058] In some embodiments of the manufacturing method,

[0059] In step 30, the particulate matter is a mixture of raw sand and steel balls, and the specific gravity of the raw sand and the steel balls ranges from 4.2 to 7.2.

[0060] In some embodiments of the manufacturing method,

[0061] In step 50, the molten metal is molten aluminum, and the casting method is configured to adopt a low-pressure casting method; or

[0062] In the step 50, the molten metal is molten iron or molten steel, and the casting method is configured to adopt a gravity casting method.

[0063] In the manufacturing method of some embodiments, in the step 50, the molten metal is molten aluminum, and the step 50 also includes inverting the sand box on a sealed tank containing the molten aluminum, connecting the pouring cup of the shell sand mold with a riser connected to the sealed tank, introducing compressed air into the sealed tank, causing the molten aluminum to rise in the riser and enter the shell sand mold through the pouring cup, and maintaining the gas pressure of the compressed air after the molten aluminum fills the shell sand mold; wherein,

[0064] In step 50, the time from when the aluminum liquid enters the shell sand mold to when the shell sand mold is filled is controlled to be in the range of 10 to 15 seconds; and / or

[0065] In step 50, the time for maintaining the gas pressure of the compressed air is controlled to be in the range of 15 to 20 seconds.

[0066] The roller frame provided by the present disclosure includes a roller front frame, a roller rear frame and a connecting part, wherein the roller front frame and the roller rear frame are connected by the connecting part, and the roller front frame and the roller rear frame are integrally cast one-piece parts. The roller front frame and the roller rear frame are integrally cast one-piece parts, which is beneficial to improving the material utilization rate on the one hand, and is beneficial to improving the molding freedom of the roller frame on the other hand, so as to reasonably set the structure, shape, parameters, connection relationship and hollowing process of each functional part under the condition of meeting the strength of the workpiece, which is beneficial to simplify the structural design of the roller front frame and the roller rear frame, so as to realize the lightweight of the roller frame. In addition, the roller front frame and the roller rear frame are respectively weld-free structures, which is beneficial to increase the structural rigidity of the roller frame and improve the reliability of the roller frame.

[0067] The road roller of the present disclosure includes the road roller frame of the present disclosure, thereby having the advantages of the road roller frame of the present disclosure.

[0068] The manufacturing method of the roller frame provided by the present disclosure includes using a casting method to make the roller front frame and the roller rear frame respectively integrally cast as one-piece molded parts, and using a connecting part to connect the roller front frame and the roller rear frame. Due to the use of the casting process, the manufacturing method is conducive to improving the material utilization rate and effectively reducing the processing amount of the roller frame, thereby reducing the production time and improving the production efficiency.

[0069] Other features and advantages of the present disclosure will become apparent from the following detailed description of exemplary embodiments of the present disclosure with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] The drawings described herein are used to provide a further understanding of the present disclosure and constitute a part of the present application. The illustrative embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation on the present disclosure. In the drawings:

[0071] Figure 1 It is a structural schematic diagram of a front frame of a road roller according to an embodiment of the present disclosure;

[0072] Figure 2 It is a structural schematic diagram of a rear frame of a road roller according to an embodiment of the present disclosure;

[0073] Figure 3 This is a schematic structural diagram of a casting device used in a casting method according to an embodiment of the present disclosure.

[0074] Figures 1 to 3 In the figure, each reference numeral represents:

[0075] 100. front frame of road roller, 110. front frame supporting body, 111. transverse supporting part, 1111. front supporting section, 1112. rear supporting section, 112. front cross beam of support seat, 1121. left cross beam section, 1122. right cross beam section, 112a. front cross beam mounting hole, 113. longitudinal supporting part, 1131. front assembly part, 1131a. front assembly part hollow hole, 114. rear cross beam of support seat, 114a. rear cross beam mounting hole, 120. side protection part of front frame, 121. left protection part of front frame, 122. right protection part of front frame, 130. water tank mounting seat, 131. left water tank mounting part, 132. right water tank mounting part;

[0076] 200, rear frame of road roller, 210, fan bracket, 211, fan bracket body, 212, fan bracket lateral support portion, 220, rear frame side protection portion, 221, rear frame left protection member, 222, rear frame right protection member, 222a, avoidance hole, 230, rear frame bottom support portion, 231, rear assembly portion, 231a, rear assembly portion hollow hole;

[0077] 11. Upper sand box, 12. Lower sand box, 2. Vibrating plate, 3. Shell sand mold, 4. Granular matter. DETAILED DESCRIPTION

[0078] The technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present disclosure and its application or use. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0079] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present disclosure. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0080] In the description of the present disclosure, it should be understood that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present disclosure.

[0081] In the description of the present disclosure, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, upright, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present disclosure and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present disclosure; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0082] The embodiment of the present disclosure provides a roller frame. The roller frame includes a roller front frame 100, a roller rear frame 200 and a connection portion (not shown). The roller front frame 100 and the roller rear frame 200 are connected by the connection portion. The roller front frame 100 and the roller rear frame 200 are integrally cast one-piece molded parts.

[0083] The front frame and the rear frame of the roller are integrally cast, which is beneficial to improving the material utilization rate on the one hand and improving the molding freedom of the roller frame on the other hand, so as to reasonably set the structure, shape, parameters, connection relationship and hollowing process of each functional part while meeting the strength of the workpiece, simplify the structural design of the front frame 100 and the rear frame 200 of the roller, and thus realize the lightweight of the roller frame. In addition, the front frame 100 and the rear frame 200 of the roller are respectively weld-free structures, which is beneficial to increase the structural rigidity of the roller frame and improve the reliability of the roller frame.

[0084] In some embodiments, the connection may include, for example, a hinge arrangement.

[0085] like Figure 1As shown, in some embodiments, the front frame 100 of the road roller includes a front frame support body 110, a front frame side protection part 120 and a water tank mounting seat 130. The front frame support body 110 is configured to support the cab and connect the connection part. The front frame side protection part 120 includes a front frame left side protection part 121 and a front frame right side protection part 122. The front frame support body 110 is connected between the front frame left side protection part 121 and the front frame right side protection part 122. The water tank mounting seat 130 is located at the rear of the lower part of the front frame support body 110. The water tank mounting seat 130 includes a left side water tank mounting part 131 and a right side water tank mounting part 132. The left side water tank mounting part 131 is located between the front frame left side protection part 121 and the front frame support body 110. The right side water tank mounting part 132 is located between the front frame right side protection part 122 and the front frame support body 110.

[0086] This arrangement simplifies the structure of the front frame 100 of the road roller, and is conducive to forming the front frame 100 of the road roller into an integrated structure, thereby being conducive to lightweight requirements and integral casting of the front frame 100 of the road roller. At the same time, this arrangement retains the main structural functions of the front frame 100 of the road roller, including providing a front frame support body 110 to support the cab and the connection part, providing a front frame side protection part 120 to connect and protect the front frame support body 110, and providing a water tank mounting seat 130 to accommodate the water tank.

[0087] like Figure 1 As shown, in some embodiments, the front frame support body 110 includes a transverse support portion 111, a support seat front cross beam 112, a longitudinal support portion 113 and a support seat rear cross beam 114. The transverse support portion 111 includes a front support section 1111 and a rear support section 1112. The front support section 1111 is fixedly connected to the front frame left side protection member 121 and the front frame right side protection member 122. The rear support section 1112 is connected to the rear side of the front support section 1111 and is spaced apart from the front frame left side protection member 121 and the front frame right side protection member 122.

[0088] The support seat front cross beam 112 includes a left cross beam section 1121 and a right cross beam section 1122 which are spaced apart from each other in the left-right direction. The left cross beam section 1121 is connected between the left side protection member 121 of the front frame and the rear support section 1112. The right cross beam section 1122 is connected between the right side protection member 122 of the front frame and the rear support section 1112. The left cross beam section 1121 and the right cross beam section 1122 respectively include front cross beam mounting holes 112a for connecting with the cab.

[0089] The longitudinal support part 113 is located at the rear lower part of the transverse support part 111 and is configured to connect the connection part. The left water tank mounting part 131 is connected between the left side protection part 121 of the front frame and the longitudinal support part 113. The right water tank mounting part 132 is connected between the right side protection part 122 of the front frame and the longitudinal support part 113.

[0090] The support seat rear cross beam 114 and the support seat front cross beam 112 are spaced apart from each other in the front-to-rear direction, and are connected between the rear end of the rear support section 1112 of the transverse support portion 111 and the upper end of the longitudinal support portion 113. The support seat rear cross beam 114 includes a rear cross beam mounting hole 114a for connecting to the cab.

[0091] The structural arrangement of the front frame support body 110 is conducive to simplifying the structure, thereby facilitating the integrated molding of the front frame support body 110. The front support section 1111 is fixedly connected to the front frame left side protection member 121 and the front frame right side protection member 122, which is conducive to ensuring the connection strength between the lateral support portion 111 and the front frame side protection portion 120. The rear support section 1112 is spaced from the front frame left side protection member 121 and the front frame right side protection member 122, which is conducive to reducing the structure of the lateral support portion 111, thereby facilitating the lightweight design of the lateral support portion 111 and reducing the use of casting materials.

[0092] The left cross beam section 1121 and the right cross beam section 1122 are arranged at intervals from each other in the left-right direction, which is conducive to simplifying the structure of the support seat front cross beam 112, thereby meeting the lightweight requirements of the roller frame. Front cross beam mounting holes 112a are respectively provided on the left cross beam section 1121 and the right cross beam section 1122, so as to facilitate the connection between the support seat front cross beam 112 and the cab, thereby playing the role of supporting the cab.

[0093] The longitudinal support portion 113 is provided to simultaneously connect with the connection portion, the left water tank mounting portion 131 and the right water tank mounting portion 132, so that the front frame support body 110 has a compact structure, thereby facilitating the integrated molding of the front frame support body 110.

[0094] The rear cross beam 114 of the support seat connects the transverse support portion 111 and the longitudinal support portion 113, which is beneficial to making the structure of the front frame support body 110 compact, and a rear cross beam mounting hole 114a is provided on the rear cross beam 114 of the support seat to facilitate the connection between the rear cross beam 114 of the support seat and the cab, thereby cooperating with the front cross beam 112 of the support seat to play a role in supporting the cab.

[0095] like Figure 1 As shown, in some embodiments, the front frame left side protection member 121 and the front frame right side protection member 122 are hollow plates, the transverse support portion 111 is a hollow plate, and the longitudinal support portion 113 is a hollow plate.

[0096] This arrangement is conducive to reducing the weight of the front frame 100 of the road roller, thereby helping to meet the demand for lightweight. On the other hand, this arrangement is conducive to reducing the use of casting materials, thereby helping to reduce manufacturing costs.

[0097] like Figure 1 As shown, in some embodiments, the front support segment 1111 includes a front support segment hollow hole. The rear support segment 1112 includes a rear support segment hollow hole. For example, the front support segment 1111 may include a plurality of front support segment hollow holes spaced from each other in the left-right direction. For another example, the front support segment 1111 may also include a front support segment hollow hole, and the front support segment hollow hole may be located in the middle of the front support segment 1111. For example, the rear support segment 1112 includes a rear support segment hollow hole, and the rear support segment hollow hole may be located in the middle of the rear support segment 1112. For another example, the rear support segment 1112 may include a plurality of rear support segment hollow holes spaced from each other in the front-to-back direction.

[0098] This setting is conducive to designing hollow holes in accordance with different process requirements and improving manufacturing flexibility.

[0099] like Figure 1 As shown, in some embodiments, the front frame left side guard 121 or the front frame right side guard 122 includes at least one front frame guard hollow hole. The edge shape of at least part of the at least one front frame guard hollow hole is consistent with the edge shape of the front frame left side guard 121 or the front frame right side guard 122 on the corresponding side. For example, taking the front frame left side guard 121 as an example (the front frame right side guard 122 is configured to have the same structure as the front frame left side guard 121), the front frame left side guard 121 includes a first guard hollow hole, a second guard hollow hole and a third guard hollow hole. The first guard hollow hole, the second guard hollow hole and the third guard hollow hole are arranged from top to bottom on the front frame left side guard 121. The first guard hollow hole is a pentagonal hole, and the connection parts of the first guard hollow hole are rounded. The four edges of the first guard hollow hole located at the top are consistent with the shape of the edges of the front frame left side guard 121. The hollow hole of the second protective member is a pentagonal hole, and the connection parts of the hollow hole of the second protective member adopt rounded transition. One side of the hollow hole of the second protective member located on the front side and two sides at an angle to each other at the rear side are consistent with the shape of the edge of the left side protective member 121 of the front frame. The hollow hole of the third protective member is a pentagonal hole, and the connection parts of the hollow hole of the third protective member adopt rounded transition. Two sides at an angle to each other located on the front side and one side at the rear side of the hollow hole of the third protective member are consistent with the shape of the edge of the left side protective member 121 of the front frame.

[0100] The above hollow hole arrangement method is also beneficial to reducing deformation or damage caused by stress concentration due to uneven structural shape, thereby helping to improve the overall structural strength of the front frame left side guard 121 and the front frame right side guard 122, and is beneficial to making the front frame 100 as lightweight as possible while ensuring the overall structural strength of the roller, and is also beneficial to extending the service life of the front frame left side guard 121 and the front frame right side guard 122.

[0101] In some embodiments, the longitudinal support portion 113 includes a front assembly portion 1131. The front assembly portion 1131 is located at the lower portion of the longitudinal support portion 113, and the front assembly portion 1131 includes a front assembly portion hollow hole 1131a and a plurality of first threaded holes (not shown). The plurality of first threaded holes are arranged at intervals around the front assembly portion hollow hole 1131a, and the plurality of first threaded holes are configured to be connected to the front end of the connection portion. The left water tank mounting portion 131 is connected between the left side guard 121 of the front frame and the front assembly portion 1131, and the right water tank mounting portion 132 is connected between the right side guard 122 of the front frame and the front assembly portion 1131.

[0102] This arrangement enables the front assembly part hollow hole 1131a to be located between the plurality of first threaded holes, which is beneficial for utilizing the front assembly part hollow hole 1131a to reduce the weight of the front assembly part 1131. In addition, the arrangement of the connection position of the left water tank mounting part 131 and the right water tank mounting part 132 is beneficial for the water tank mounting seat 130 to be integrally formed with the longitudinal support part 113, thereby facilitating the casting of the front frame 100 of the road roller.

[0103] like Figure 1 As shown, in some embodiments, the support seat front cross beam 112 is configured as an L-shape, including a transverse front cross beam plate and a longitudinal front cross beam plate. One end of the transverse front cross beam plate away from the longitudinal front cross beam plate is connected to the front frame side protection portion 120. The front cross beam mounting hole 112a is provided on the transverse front cross beam plate. The top end of the longitudinal front cross beam plate is smoothly connected to one end of the rear support section 1112 of the transverse front cross beam plate close to the transverse support portion 111, and the bottom end of the longitudinal front cross beam plate is smoothly connected to the rear support section 1112.

[0104] The rear cross beam 114 of the support seat includes a support plate with a groove-shaped cross section. The support plate includes a rear cross beam mounting plate, a rear cross beam front connecting plate connected to the lower side of the front end of the rear cross beam mounting plate, and a rear cross beam rear connecting plate connected to the lower side of the rear end of the rear cross beam mounting plate. The rear cross beam mounting hole 114a is provided on the rear cross beam mounting plate. The rear cross beam front connecting plate is smoothly connected to the rear end of the rear support section 1112 of the transverse support portion 111, and the rear cross beam rear connecting plate is smoothly connected to the top end of the longitudinal support portion 113.

[0105] The left water tank mounting portion 131 includes a U-shaped left water tank support member. The left water tank support member includes a first free end and a second free end. The first free end is smoothly connected to the left side protection member 121 of the front frame, and the second free end is smoothly connected to the left side of the lower part of the longitudinal support portion 113.

[0106] The right water tank mounting portion 132 includes a U-shaped right water tank support member. The right water tank support member includes a third free end and a fourth free end. The third free end is smoothly connected to the right side protection member 122 of the front frame, and the fourth free end is smoothly connected to the right side of the lower part of the longitudinal support portion 113.

[0107] The support seat front cross beam 112 is set to be L-shaped, and the end of the transverse front cross beam plate of the support seat front cross beam 112 away from the longitudinal front cross beam plate is connected to the front frame side protection part 120, which is conducive to improving the connection strength between the support seat front cross beam 112 and the front frame side protection part 120. The top end of the longitudinal front cross beam plate is smoothly connected to one end of the rear support section 1112 of the transverse front cross beam plate close to the transverse support part 111, and the bottom end of the longitudinal front cross beam plate is smoothly connected to the rear support section 1112. The two smooth connection positions are conducive to reducing stress concentration, thereby facilitating improving the structural strength of the front frame 100 of the road roller.

[0108] The front connecting plate of the rear cross beam is smoothly connected to the rear end of the rear support section 1112 of the transverse support portion 111, which is conducive to reducing the stress concentration at the connection position between the front connecting plate of the rear cross beam and the rear support section 1112, thereby facilitating improving the structural strength of the front frame 100 of the road roller. The rear connecting plate of the rear cross beam is smoothly connected to the top end of the longitudinal support portion 113, which is conducive to reducing the stress concentration at the connection position between the rear connecting plate of the rear cross beam and the longitudinal support portion 113, thereby facilitating improving the structural strength of the front frame 100 of the road roller.

[0109] The first free end and the second free end of the left water tank support and the third free end and the fourth free end of the right water tank support are smoothly connected to other positions of the front frame 100 of the roller, which is beneficial to reduce stress concentration at these connection positions, thereby helping to improve the structural strength of the front frame 100 of the roller.

[0110] like Figure 2 As shown, in some embodiments, the rear frame 200 of the road roller includes a fan bracket 210, a rear frame side protection part 220, and a rear frame bottom support part 230. The rear frame side protection part 220 includes a rear frame left side protection part 221 and a rear frame right side protection part 222. The fan bracket 210 is located between the upper part of the rear frame left side protection part 221 and the upper part of the rear frame right side protection part 222. The rear frame bottom support part 230 is located between the lower part of the rear frame left side protection part 221 and the lower part of the rear frame right side protection part 222, and is configured to connect the connection part.

[0111] This arrangement simplifies the structure of the rear frame 200 of the road roller, which is conducive to forming an integrated structure of the rear frame 200 of the road roller, thereby meeting the lightweight requirements and integrally casting the rear frame 200 of the road roller. At the same time, this arrangement retains the main structural functions of the rear frame 200 of the road roller, including providing a fan bracket 210 for installing a fan, providing a front frame side protection portion 120 for connecting and protecting the fan bracket 210, and providing a rear frame bottom support portion 230 to serve as a bottom support of the rear frame 200 of the road roller and a connection portion.

[0112] like Figure 2 As shown, in some embodiments, the fan bracket 210 includes a fan bracket body 211 and a fan bracket transverse support portion 212. The fan bracket transverse support portion 212 is connected to the rear side of the fan bracket body 211. The fan bracket transverse support portion 212 is a hollow plate. The rear frame side protection portion 220 is a hollow plate. The rear frame bottom support portion 230 is a hollow plate.

[0113] Providing a fan bracket transverse support portion 212 connected to the rear side of the fan bracket body 211 is conducive to strengthening the connection strength between the fan bracket 210 and the front frame side protection portion 120, as well as the structural strength of the fan bracket 210 itself. The fan bracket transverse support portion 212 is a hollow plate, the rear frame side protection portion 220 is a hollow plate, and the rear frame bottom support portion 230 is a hollow plate, which is conducive to meeting the demand for lightweight, and is also conducive to reducing the use of casting materials, thereby helping to reduce manufacturing costs. In addition, providing the fan bracket transverse support portion 212 as a hollow plate is conducive to reducing the weight of the fan bracket 210, and is conducive to reducing the connection burden between the fan bracket 210 and the front frame side protection portion 120, thereby helping to improve the structural strength of the rear frame 200 of the roller.

[0114] like Figure 2As shown, in some embodiments, the rear frame left side guard 221 or the rear frame right side guard 222 includes at least one rear frame guard hollow hole. The edge shape of at least part of the at least one rear frame guard hollow hole is consistent with the edge shape of the rear frame left side guard 221 or the rear frame right side guard 222 on the corresponding side. For example, taking the rear frame left side guard 221 as an example (the rear frame right side guard 222 is configured to have the same structure as the rear frame left side guard 221), the rear frame left side guard 221 includes a fourth guard hollow hole, a fifth guard hollow hole, a sixth guard hollow hole and a seventh guard hollow hole. The fourth guard hollow hole, the fifth guard hollow hole, the sixth guard hollow hole and the seventh guard hollow hole are arranged from top to bottom on the rear frame left side guard 221. The fourth guard hollow hole is a pentagonal hole, and the connecting parts of the edges of the fourth guard hollow hole adopt rounded transition. The two sides of the fourth protective member hollow hole located at the top, one side located at the front side and one side located at the rear side are consistent with the shape of the edge of the left side protective member 221 of the rear frame. The fifth protective member hollow hole is a quadrilateral hole, and the connection parts of the fifth protective member hollow hole adopt rounded transition. One side of the fifth protective member hollow hole located at the front side and one side of the fifth protective member hollow hole are consistent with the shape of the edge of the left side protective member 121 of the front frame on the corresponding side. The sixth protective member hollow hole is set in a similar manner to the fifth protective member hollow hole. One side of the seventh protective member hollow hole located at the bottom and one side of the rear side are consistent with the shape of the edge of the left side protective member 121 of the front frame, and one side of the seventh protective member hollow hole connected to the bottom side and the rear side protrudes toward the inside of the seventh protective member hollow hole, and a avoidance hole 222b is set at the rear lower corner of the rear right protective member 222, and the avoidance hole 222b is used for the pipeline to pass through the rear lower corner of the right side protective member 222 of the rear frame.

[0115] Providing at least a portion of the edge shape of the hollow hole of at least one rear frame guard to be consistent with the edge shape of the left side guard 221 of the rear frame or the right side guard 222 of the rear frame on the corresponding side is beneficial to reducing deformation or damage caused by stress concentration due to uneven structural shapes, thereby helping to improve the overall structural strength of the left side guard 221 of the rear frame or the right side guard 222 of the rear frame, and is beneficial to making the overall structural strength of the rear frame 200 of the roller as lightweight as possible while ensuring it. It is also beneficial to extending the service life of the rear frame 200 of the roller.

[0116] like Figure 2As shown, in some embodiments, the rear frame bottom support portion 230 includes a rear assembly portion 231. The rear assembly portion 231 is located in the middle of the rear frame bottom support portion 230. The rear assembly portion includes a rear assembly portion hollow hole 231a and a plurality of second threaded holes (not shown). The plurality of second threaded holes are arranged at intervals around the rear assembly portion hollow hole 231a. The plurality of second threaded holes are configured to be connected to the rear end of the connection portion.

[0117] This arrangement enables the hollow hole 231a of the rear assembly part to be located between the plurality of second threaded holes, which is beneficial for utilizing the hollow hole 231a of the rear assembly part to reduce the weight of the rear assembly part 231, thereby helping to meet the demand for lightweighting.

[0118] like Figure 2 As shown, in some embodiments, the rear frame bottom support portion 230 is configured as a U-shape, including a fifth free end and a sixth free end. The fifth free end is smoothly connected to the right side of the lower portion of the rear frame left side protection member 221. The sixth free end is smoothly connected to the left side of the lower portion of the rear frame right side protection member 222.

[0119] This arrangement is beneficial to reducing stress concentration at the fifth free end and the sixth free end, thereby helping to improve the structural strength of the rear frame 200 of the road roller.

[0120] On the other hand, an embodiment of the present disclosure provides a road roller, which includes the road roller frame provided by the embodiment of the present disclosure, thereby having the advantages of the road roller frame of the present disclosure.

[0121] In some embodiments, the roller further comprises a cab, a water tank, a front roller, a rear roller, a front vibration left plate, a front vibration right plate, a rear vibration left plate, a rear vibration right plate, and a fan, etc. The cab comprises four supports located below the cab, and the four supports are respectively assembled in two front cross beam mounting holes 112a and two rear cross beam mounting holes 114a of the roller frame to support the front frame support body 110. The front frame left side guard 121 is connected to the front vibration left side plate, and the front frame right side guard 122 is connected to the front vibration right side plate to support the front roller of the roller. The water tank is mounted on the water tank mounting seat 130. The rear frame left side guard 221 is connected to the rear vibration left side plate, and the rear frame right side guard 222 is connected to the rear vibration right side plate to support the rear roller of the roller. The fan is mounted on the fan bracket 210 of the rear frame 200 of the roller.

[0122] On the other hand, an embodiment of the present disclosure provides a method for manufacturing a roller frame provided by an embodiment of the present disclosure, the manufacturing method comprising preparing a front roller frame 100 and a rear roller frame 200 of the roller frame, comprising using a casting method to make the front roller frame 100 and the rear roller frame 200 respectively integrally cast as one-piece molded parts; and using a connecting part to connect the front roller frame 100 and the rear roller frame 200.

[0123] The manufacturing method of the roller frame provided by the present disclosure includes using a casting method to make the roller front frame 100 and the roller rear frame 200 integrally cast as one-piece components, and using a connecting part to connect the roller front frame 100 and the roller rear frame 200. Due to the use of the casting process, the manufacturing method is conducive to improving the material utilization rate and effectively reducing the processing amount of the roller frame, thereby reducing the production time and improving the production efficiency.

[0124] like Figure 3 As shown, the casting method comprises:

[0125] Step 10, forming a shell-type sand mold 3 based on 3D printing technology, the shell-type sand mold 3 includes a sand mold surface consistent with the shape of the front frame 100 or the rear frame 200 of the roller, and the internal space of the shell-type sand mold 3 is configured to include a molding space consistent with the shape of the front frame 100 or the rear frame 200 of the roller.

[0126] Step 30 , placing the shell sand mold 3 in a sand box, and pouring granular material 4 into the gap between the sand box and the shell sand mold 3 .

[0127] Step 50 , pouring molten metal into the shell sand mold 3 , so that a frame casting blank having the same shape as the front frame 100 or the rear frame 200 of the road roller is formed in the shell sand mold 3 .

[0128] Step 70, after cooling the sand box and its interior, the sand box is opened, and the combined structure of the shell sand mold 3 and the frame casting blank is taken out.

[0129] Step 90 , cooling the combined structure, taking out the frame ingot, and performing surface processing on the frame ingot to obtain an integrally formed front frame 100 or rear frame 200 of the road roller.

[0130] The manufacturing method of the roller frame based on the present disclosure adopts a casting method including forming a shell sand mold 3 including a sand mold surface consistent with the shape of the roller front frame 100 or the roller rear frame 200 based on 3D printing technology, pouring granules 4 in the gap between the sand box and the shell sand mold 3 in the sand box, pouring molten metal into the shell sand mold 3, taking out the combined structure of the shell sand mold 3 and the frame casting blank after cooling, and surface processing the frame casting blank to obtain an integrally formed roller front frame 100 or roller rear frame 200. The casting method adopts 3D printing technology to form a shell sand mold 3 including a sand mold surface consistent with the shape of the roller front frame 100 or the roller rear frame 200, which is conducive to making the shell sand mold 3 accurately match the structure of the roller front frame 100 or the roller rear frame 200, thereby facilitating the improvement of material utilization, ensuring manufacturing accuracy, facilitating the assembly and assembly of the roller frame, and saving 3D printing materials. In addition, the casting method is conducive to adapting to common casting materials such as cast steel, cast iron and cast aluminum, so that it is conducive to changing the casting material according to different process requirements without having to remake the shell sand mold 3, thereby helping to improve production efficiency.

[0131] like Figure 3 As shown, in some embodiments, step 30 further comprises vibrating the sand box when pouring the granular material 4 into the gap between the sand box and the shell sand mold 3. For example, the sand box can be vibrated using a vibration plate 2 located at the bottom of the sand box.

[0132] The vibrating sand box is conducive to filling the particles 4 tightly and evenly in the gap between the sand box and the shell sand mold 3, which helps to reduce the pores and gaps that appear during the casting process, and also helps to transfer heat evenly, thereby avoiding the shaking of the shell sand mold 3 in the sand box or the thermal effect that affects the finished product quality of the frame casting.

[0133] In some embodiments, step 30 further includes adjusting the vibration frequency of the vibrating sand box so that the vibration frequency gradually increases.

[0134] Gradually increasing the vibration frequency helps to accelerate the flow and filling of the particles 4 in the gap between the sand box and the shell sand mold 3, and is beneficial to further evenly distribute the particles 4 in the gap, so as to reduce filling dead corners and gaps, thereby improving efficiency.

[0135] In some embodiments, the particulate matter 4 in step 30 is a mixture of raw sand and steel balls, and the specific gravity of the raw sand and the steel balls ranges from 4.2 to 7.2.

[0136] The rolling and squeezing action of the steel balls can make it easier to discharge the gas in the raw sand, thereby improving the filling effect of the particles 4 between the sand box and the shell sand box 3. The use of a mixture of raw sand and steel columns is conducive to significantly reducing the amount of resin, curing agent and raw sand, thereby improving economic benefits and realizing industrial production. The specific gravity range of raw sand and steel balls is 4.2~7.2. The steel balls in this setting are conducive to improving the structural rigidity of the shell sand mold 3. This specific gravity range is conducive to saving production costs on the basis of meeting the process requirements of structural rigidity.

[0137] In some embodiments, in step 50, the molten metal is molten aluminum, and the casting method is configured to adopt a low-pressure casting method. Using the molten metal as molten aluminum is conducive to reducing the weight of the roller frame and improving the corrosion resistance of the roller frame. In other embodiments, in step 50, the molten metal is molten iron or molten steel, and the casting method is configured to adopt a gravity casting method. Using the molten metal as molten iron or molten steel is conducive to improving the structural strength and rigidity, thereby improving the bearing capacity of the roller frame, and secondly, it is also conducive to reducing the manufacturing cost.

[0138] In some embodiments, step 50 also includes placing the sand box upside down on a sealed tank containing molten aluminum, connecting the pouring cup of the shell sand mold 3 to a riser connected to the sealed tank, introducing compressed air into the sealed tank, causing the molten aluminum to rise in the riser and enter the shell sand mold 3 through the pouring cup, and maintaining the gas pressure of the compressed air after the molten aluminum fills the shell sand mold 3.

[0139] The casting method is beneficial to improving the compactness of the formed frame ingot, thereby improving the mechanical properties and tensile strength of the roller frame. The casting method is also beneficial to forming a frame ingot with a clear outline and a smooth surface, thereby forming a large thin-walled roller frame.

[0140] The time range of controlling the aluminum liquid to enter the shell sand mold 3 and fill the shell sand mold 3 is 10 to 15 seconds. The time range of controlling the gas pressure of the compressed air to be maintained is 15 to 20 seconds.

[0141] Controlling the time for the aluminum liquid to enter the shell sand mold 3 and fill the shell sand mold 3 is conducive to completely solidifying the frame casting, thereby improving the molding quality of the frame casting. Controlling the time for maintaining the gas pressure of the compressed air is conducive to fully filling the shell sand mold 3 with metal liquid, thereby facilitating the molding of the frame casting.

[0142] The following combination Figure 1 and Figure 2 The roller frame of the disclosed embodiment is described in detail.

[0143] like Figure 1As shown, the front frame 100 of the road roller includes a front frame support body 110, a front frame side protection part 120 and a water tank mounting seat 130. The front frame side protection part 120 includes a front frame left side protection part 121 and a front frame right side protection part 122. The front frame support body 110 is connected between the front frame left side protection part 121 and the front frame right side protection part 122. The water tank mounting seat 130 is located at the rear of the lower part of the front frame support body 110. The water tank mounting seat 130 includes a left side water tank mounting part 131 and a right side water tank mounting part 132. The left side water tank mounting part 131 is located between the front frame left side protection part 121 and the front frame support body 110. The right side water tank mounting part 132 is located between the front frame right side protection part 122 and the front frame support body 110.

[0144] The front frame support body 110, the front frame side protection part 120 and the water tank mounting seat 130 are integrally formed by a casting method, so that the front frame 100 of the road roller is an integrally cast one-piece component. The front frame support body 110 is configured to support the cab and connect the connection part. The front frame left side protection part 121 and the front frame right side protection part 122 protect the front frame support body 110. The left side water tank mounting part 131 and the right side water tank mounting part 132 are configured to respectively accommodate two water tanks of the road roller. The front frame 100 of the road roller has no welds, which is conducive to increasing the structural rigidity and improving the structural reliability of the road roller.

[0145] The front frame side protection part 120 includes a front frame left side protection part 121 and a front frame right side protection part 122. The front frame support body 110 is connected between the front frame left side protection part 121 and the front frame right side protection part 122. The front frame left side protection part 121 is a strip plate protruding to the rear side, and the front frame left side protection part 121 is arranged perpendicular to the left and right directions. The front frame left side protection part 121 includes a first protection part hollow hole, a second protection part hollow hole and a third protection part hollow hole arranged at intervals from top to bottom. The first protection part hollow hole, the second protection part hollow hole and the third protection part hollow hole are conducive to reducing the weight of the front frame left side protection part 121, thereby facilitating the realization of the lightweight demand. The structure of the front frame right side protection part 122 is the same as that of the front frame left side protection part 121, and will not be repeated.

[0146] The front frame support body 110 includes a transverse support portion 111, a support seat front cross beam 112, a longitudinal support portion 113 and a support seat rear cross beam 114. The transverse support portion 111 includes a front support section 1111 and a rear support section 1112. The front support section 1111 is a π-shaped structure, and the front support section 1111 includes a front support section cross beam located at the front end of the front support section 1111, and the left end of the front support section cross beam is connected to the upper inner side of the first protective member hollow hole of the left side protective member 121 of the front frame (the right end of the front support section cross beam is symmetrically connected to the right side protective member 122 of the front frame). The rear support section 1112 is connected to the rear side of the front support section 1111, and is spaced apart from the left side protective member 121 of the front frame and the right side protective member 122 of the front frame. The front support section 1111 includes a front support section hollow hole, and the front support section hollow hole is located between the rear end of the front support section cross beam and the front end of the rear support section 1112. The rear support section 1112 includes a rear support section hollow hole, and the rear support section hollow hole is located in the middle of the rear support section 1112. This arrangement is conducive to maintaining the structural rigidity of the lateral support portion 111, and is also conducive to reducing the weight of the lateral support portion 111.

[0147] The front cross beam 112 of the support seat includes a left cross beam section 1121 and a right cross beam section 1122 which are arranged at intervals from each other in the left-right direction. The left cross beam section 1121 is connected between the left side guard 121 of the front frame and the rear support section 1112. The right cross beam section 1122 is connected between the right side guard 122 of the front frame and the rear support section 1112. The left cross beam section 1121 is configured in an L shape, including a transverse front cross beam plate and a longitudinal front cross beam plate. The left end of the transverse front cross beam plate is connected to the right side surface of the left side guard 121 of the front frame at a position between the first guard hollow hole and the second guard hollow hole. The front cross beam mounting hole 112a is provided on the transverse front cross beam plate for mounting the support of the cab of the road roller. The top end of the longitudinal front cross beam plate is smoothly connected to the right end of the transverse front cross beam plate, and the bottom end of the longitudinal front cross beam plate is smoothly connected to the left side of the front end of the rear support section 1112. The structure of the right cross beam section 1122 is the same as that of the left cross beam section 1121 and will not be described in detail below.

[0148] The support seat rear cross beam 114 and the support seat front cross beam 112 are spaced apart from each other in the front-to-back direction. The support seat rear cross beam 114 includes a support plate with a groove-shaped cross section. The support plate includes a rear cross beam mounting plate, a rear cross beam front connecting plate connected to the lower side of the front end of the rear cross beam mounting plate, and a rear cross beam rear connecting plate connected to the lower side of the rear end of the rear cross beam mounting plate. Two rear cross beam mounting holes 114a are spaced apart from each other in the left-right direction on the rear cross beam mounting plate. The rear cross beam front connecting plate is smoothly connected to the rear end of the rear support section 1112 of the transverse support portion 111, and the rear cross beam rear connecting plate is smoothly connected to the top end of the longitudinal support portion 113.

[0149] The longitudinal support portion 113 is located below the rear connecting plate of the rear cross beam and is configured to connect the connecting portion. The longitudinal support portion 113 includes a front assembly portion 1131. The front assembly portion 1131 is located at the lower portion of the longitudinal support portion 113, and the front assembly portion 1131 includes a front assembly portion hollow hole 1131a and a plurality of first threaded holes. The plurality of first threaded holes are arranged at intervals around the front assembly portion hollow hole 1131a, and the plurality of first threaded holes are configured to connect to the front end of the connecting portion.

[0150] The water tank mounting seat 130 includes a left water tank mounting portion 131 and a right water tank mounting portion 132. The left water tank mounting portion 131 includes a U-shaped left water tank support. The left water tank support includes a first free end and a second free end. The first free end is smoothly connected to the lower rear side of the left side guard 121 of the front frame, and the second free end is smoothly connected to the left side of the front assembly portion 1131, so that the left water tank mounting portion 131 is connected between the left side guard 121 of the front frame and the longitudinal support portion 113. The right water tank mounting portion 132 includes a U-shaped right water tank support. The right water tank support includes a third free end and a fourth free end. The third free end is smoothly connected to the lower rear side of the right side guard 122 of the front frame, and the fourth free end is smoothly connected to the right side of the front assembly portion 1131, so that the right water tank mounting portion 132 is connected between the right side guard 122 of the front frame and the longitudinal support portion 113.

[0151] like Figure 2 As shown, the rear frame 200 of the road roller includes a fan bracket 210, a rear frame side protection portion 220 and a rear frame bottom support portion 230. The fan bracket 210 includes a fan bracket main body 211 and a fan bracket transverse support portion 212. The fan bracket transverse support portion 212 is connected to the rear side of the fan bracket main body 211. The fan bracket main body 211 includes three grooves spaced from each other in the left-right direction, the groove in the middle is configured to accommodate the fan of the road roller, and the grooves on both sides are configured to accommodate other accessories of the road roller. The fan bracket transverse support portion 212 includes four fan bracket hollow holes spaced from each other in the left-right direction. The two fan bracket hollow holes in the middle of the four fan bracket hollow holes are oblong holes, which is conducive to expanding the hollow area, thereby helping to meet the requirements of lightweight.

[0152] The rear frame side protection part 220 includes a rear frame left side protection part 221 and a rear frame right side protection part 222. The rear frame left side protection part 221 includes a fourth protection part hollow hole, a fifth protection part hollow hole, a sixth protection part hollow hole and a seventh protection part hollow hole arranged from top to bottom on the rear frame left side protection part 221. The left end of the fan bracket main body 211 is connected to a position between the fourth protection part hollow hole and the fifth protection part hollow hole on the right side surface of the rear frame left side protection part 221. The left end of the fan bracket transverse support part 212 is connected to a position of the lower edge of the fourth protection part hollow on the right side surface of the rear frame left side protection part 221. The structure of the rear frame right side protection part 222 is the same as that of the rear frame left side protection part 221, and the right end of the fan bracket 210 is connected to the rear frame right side protection part 222 in the same manner as the left end, which will not be repeated here. This arrangement is beneficial to increasing the connection strength between the fan bracket 210 and the rear frame side protection part 220, thereby helping to improve the safety of use of the rear frame 200 of the road roller.

[0153] An edge of the seventh protective member hollow hole connected between an edge at the bottom and an edge at the rear side protrudes toward the interior of the seventh protective member hollow hole, and an avoidance hole 222b is provided at the rear lower corner of the right side protective member 222 of the rear frame, and the avoidance hole 222b is used for the pipeline to pass through the rear lower corner of the right side protective member 222 of the rear frame.

[0154] The rear frame bottom support portion 230 is located between the lower portion of the rear frame left side guard 221 and the lower portion of the rear frame right side guard 222. The rear frame bottom support portion 230 includes a rear assembly portion 231. The rear assembly portion 231 is located in the middle of the rear frame bottom support portion 230. The rear assembly portion includes a rear assembly portion hollow hole 231a and a plurality of second threaded holes. The plurality of second threaded holes are arranged at intervals around the rear assembly portion hollow hole 231a. The plurality of second threaded holes are configured to be connected to the rear end of the connecting portion. The rear frame bottom support portion 230 is configured in a U shape and includes a fifth free end and a sixth free end. The fifth free end is smoothly connected to the right side of the lower portion of the rear frame left side guard 221. The sixth free end is smoothly connected to the left side of the lower portion of the rear frame right side guard 222. The rear frame bottom support portion 230 also includes two bottom support portion hollow holes, which are respectively located between the rear assembly portion 231 and the fifth free end and between the rear assembly portion 231 and the sixth free end. This arrangement is helpful in reducing the weight of the rear frame bottom support portion 230, thereby helping to meet the demand for lightweight.

[0155] The following combination Figure 3 The casting method of the embodiment of the present disclosure is described in detail. The casting method comprises:

[0156] Step 10, forming a shell sand mold 3 based on 3D printing technology, the shell sand mold 3 includes a sand mold surface consistent with the shape of the roller front frame 100 or the roller rear frame 200, and the internal space of the shell sand mold 3 is configured to include a molding space consistent with the shape of the roller front frame 100 or the roller rear frame 200. The wall thickness of the shell sand mold 3 is, for example, 20 mm to 100 mm.

[0157] Step 30 , placing the shell sand mold 3 in a sand box, and pouring granular material 4 into the gap between the sand box and the shell sand mold 3 .

[0158] Step 50 , pouring molten metal into the shell sand mold 3 , so that a frame casting blank having the same shape as the front frame 100 or the rear frame 200 of the road roller is formed in the shell sand mold 3 .

[0159] Step 70, after cooling the sand box and its interior, the sand box is opened, and the combined structure of the shell sand mold 3 and the frame casting blank is taken out.

[0160] Step 90 , cooling the combined structure, taking out the frame ingot, and performing surface processing on the frame ingot to obtain an integrally formed front frame 100 or rear frame 200 of the road roller.

[0161] In step 50, the molten metal includes molten iron, molten steel or molten aluminum, etc. This casting method is conducive to adapting to various casting materials, thereby facilitating changing the casting material according to different process requirements without remaking the shell sand mold 3, thereby facilitating improving production efficiency.

[0162] In this embodiment, the sand box includes an upper sand box 11 and a lower sand box 12, and step 30 also includes: placing the shell sand mold 3 at the bottom of the lower sand box 12, combining the upper sand box 11 and the lower sand box 12, and then pouring granular material 4 into the gap between the combined sand box and the shell sand mold 3.

[0163] A vibration plate 2 is provided below the sand box. Step 30 further includes: opening the vibration plate 2 to vibrate the sand box, pouring granular material 4 into the gap between the sand box and the shell sand mold 3, and adjusting the vibration frequency of the vibration plate 2 to gradually increase the vibration frequency.

[0164] The following describes the casting methods of the molten metal in step 50 as molten iron, molten steel and molten aluminum, wherein the casting method of the molten metal as molten iron and molten steel adopts a gravity casting method, and the casting method of the molten metal as molten aluminum adopts a low-pressure casting method: Embodiment 1:

[0165] In this embodiment, the molten metal is molten iron, and the casting method is configured as a gravity casting method, including:

[0166] Step 10, forming a shell sand mold 3 based on 3D printing technology, the shell sand mold 3 includes a sand mold surface consistent with the shape of the front frame 100 or the rear frame 200 of the roller, and the internal space of the shell sand mold 3 is configured to include a molding space consistent with the shape of the front frame 100 or the rear frame 200 of the roller. The average diameter of the raw sand ranges from 0.1 to 0.25 mm, the addition amount of the resin ranges from 3.0 to 4.0 wt.%, and the addition amount of the curing agent ranges from 0.3 to 0.5 wt.%. The thickness of the shell sand mold 3 can be 20 mm to 100 mm. Different parts can be set with the same or different thicknesses as needed.

[0167] Step 30, placing the shell sand mold 3 in the sand box, and pouring the granules 4 into the gap between the sand box and the shell sand mold 3, while turning on the vibration plate 2 and adjusting the vibration frequency of the vibration plate 2. The granules 4 are a mixture of raw sand and steel balls, and the specific gravity of the raw sand and the steel balls ranges from 4.2 to 7.2.

[0168] Step 40: desulfurize the molten iron, adjust the composition, spheroidize and inoculate the molten iron. The furnace temperature is 1450 (±10)°C. Step 40 is conducive to refining the molten metal, removing harmful impurities and regulating the composition of the molten metal, so as to improve the quality of the frame casting.

[0169] Step 50, pouring molten iron into the shell sand mold 3, so that a frame casting billet having the same shape as the front frame 100 of the road roller or the rear frame 200 of the road roller is formed in the shell sand mold 3. The molten metal is molten iron, and the molten metal can be selected from a general cast iron grade of QT500-7 and above, for example. Using molten iron as the molten metal is conducive to making the road roller frame meet the load-bearing requirements. In addition, the pouring temperature is 1400-1450°C, and the pouring time is 35-60s.

[0170] Step 70, after cooling the sand box and its interior, the sand box is opened, and the combined structure of the shell sand mold 3 and the frame casting blank is taken out.

[0171] Step 80, collecting the particulate matter 4 for recycling.

[0172] Step 90 , cooling the combined structure, taking out the frame ingot, and subjecting the frame ingot to machining and shot peening treatments to obtain an integrally formed front frame 100 or rear frame 200 for the road roller.

[0173] In step 90, heat treatment of the frame ingot includes:

[0174] Step 901: Normalizing, and controlling the heat treatment temperature to 850-930° C., and the heat treatment time to 1-3 hours.

[0175] Step 902: quenching, water quenching.

[0176] Step 903: Tempering, and controlling the heat treatment temperature to 500-700° C. and the heat treatment time to 1-3 hours. Embodiment 2:

[0177] In this embodiment, the molten metal is molten steel, and the casting method is configured as a gravity casting method, including:

[0178] Step 10, forming a shell sand mold 3 based on 3D printing technology, wherein the inner space of the shell sand mold 3 is configured to include a molding space having a shape consistent with the front frame 100 of the road roller or the rear frame 200 of the road roller. The average diameter of the raw sand is in the range of 0.1-0.25 mm, the addition amount of the resin is in the range of 3.0-4.0 wt.%, and the addition amount of the curing agent is in the range of 0.3-0.5 wt.%.

[0179] Step 30, placing the shell sand mold 3 in the sand box, and pouring the granules 4 into the gap between the sand box and the shell sand mold 3, while turning on the vibration plate 2 and adjusting the vibration frequency of the vibration plate 2. The granules 4 are a mixture of raw sand and steel balls, and the specific gravity of the raw sand and the steel balls ranges from 4.2 to 7.2.

[0180] Step 40: desulfurize the molten steel and adjust its composition, then pour the molten steel into a ladle, put the ladle into a casting table, and the casting table is connected to the shell sand mold 3 through a guide pipe.

[0181] Step 50, the molten steel is poured into the shell sand mold 3 through the guide pipe, so that a frame casting billet having the same shape as the front frame 100 of the road roller or the rear frame 200 of the road roller is formed in the shell sand mold 3. The molten metal is molten steel, and the molten metal can be selected from a general cast steel grade such as cast steel 340-640. This setting is conducive to making the road roller frame meet the load-bearing requirements. In addition, the pouring temperature is 1610 (± 10) ° C.

[0182] Step 70, after cooling the sand box and its interior, the sand box is opened, and the combined structure of the shell sand mold 3 and the frame casting blank is taken out.

[0183] Step 80, collecting the particulate matter 4 for recycling.

[0184] Step 90 , cooling the combined structure, taking out the frame ingot, and subjecting the frame ingot to heat treatment, machining, shot peening and other treatments to obtain an integrally formed front frame 100 or rear frame 200 of the road roller.

[0185] In step 90, heat treatment of the frame ingot includes:

[0186] Step 904: normalizing, and controlling the heat treatment temperature to 800-860° C., and the heat treatment time to 0.5-4 hours.

[0187] Step 905: quenching, water quenching.

[0188] Step 906: Tempering, and controlling the heat treatment temperature to 150-300° C. and the heat treatment time to 1-2 hours. Embodiment three:

[0189] In this embodiment, the molten metal is molten aluminum, and the casting method is configured as a low-pressure casting method, including:

[0190] Step 10, forming a shell sand mold 3 based on 3D printing technology, wherein the inner space of the shell sand mold 3 is configured to include a molding space having a shape consistent with the front frame 100 of the road roller or the rear frame 200 of the road roller. The average diameter of the raw sand is in the range of 0.1-0.25 mm, the addition amount of the resin is in the range of 3.0-4.0 wt.%, and the addition amount of the curing agent is in the range of 0.3-0.5 wt.%.

[0191] Step 30, placing the shell sand mold 3 in the sand box, and pouring granular material 4 into the gap between the sand box and the shell sand mold 3, while turning on the vibration plate 2 and adjusting the vibration frequency of the vibration plate 2, the granular material 4 is a mixture of raw sand and steel balls, and the specific gravity of the raw sand and steel balls ranges from 4.2 to 7.2.

[0192] Step 40, remelting the aluminum liquid by using the resistance furnace inside the sealed tank. The melt temperature is 660-750°C. Step 40 is conducive to refining the molten metal, removing harmful impurities and regulating the composition of the molten metal, so as to improve the quality of the frame casting.

[0193] Step 50, the sand box is placed upside down on the sealed tank containing aluminum liquid, the pouring cup of the shell sand mold 3 is connected to the riser pipe connected to the sealed tank, compressed air is introduced into the sealed tank, the aluminum liquid rises in the riser pipe and is poured into the shell sand mold 3 through the pouring cup, the time range from the aluminum liquid entering the shell sand mold 3 to filling the shell sand mold 3 is controlled to be 10 to 15 seconds, and the gas pressure of the compressed air is maintained for 15 to 20 seconds after the aluminum liquid fills the shell sand mold 3, so that a frame casting blank consistent with the shape of the front frame 100 of the road roller or the rear frame 200 of the road roller is formed in the shell sand mold 3. The metal liquid is aluminum liquid, and the metal liquid can be selected as a general cast aluminum grade such as ZL205A. This setting is conducive to making the road roller frame meet the load-bearing requirements. An asbestos sealing pad is provided between the sand box and the sealed tank.

[0194] Step 60, releasing the gas pressure to allow the unsolidified molten metal in the riser to flow back.

[0195] Step 70, after cooling the sand box and its interior, the sand box is opened, and the combined structure of the shell sand mold 3 and the frame casting blank is taken out.

[0196] Step 80, collecting the particulate matter 4 for recycling.

[0197] Step 90 , cooling the combined structure, taking out the frame ingot, and subjecting the frame ingot to heat treatment, machining, shot peening and other treatments to obtain an integrally formed front frame 100 or rear frame 200 of the road roller.

[0198] In step 90, heat treatment of the frame ingot includes:

[0199] Step 907: Solution treatment, and controlling the heat treatment temperature to 540° C. and the heat treatment time to 16 hours.

[0200] Step 908: quenching, water quenching.

[0201] Step 909: Aging treatment, and controlling the heat treatment temperature to 180° C. and the heat treatment time to 6 hours.

[0202] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present disclosure rather than to limit it. Although the present disclosure has been described in detail with reference to the preferred embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present disclosure can still be modified or some technical features can be replaced by equivalents, which should all be included in the scope of the technical solution for protection requested by the present disclosure.

Claims

1. A road roller frame, characterized in that: include: Road roller front frame (100); Road roller rear frame (200); and A connecting portion, through which the front frame (100) of the road roller and the rear frame (200) of the road roller are connected; The road roller front frame (100) and the road roller rear frame (200) are respectively integrally cast, one-piece components.

2. The roller frame according to claim 1, characterized in that: The road roller front frame (100) comprises: A front frame support body (110) configured to support the cab and connect the connection portion; A front frame side protection part (120) comprises a front frame left side protection part (121) and a front frame right side protection part (122), wherein the front frame support body (110) is connected between the front frame left side protection part (121) and the front frame right side protection part (122); and The water tank mounting seat (130) is located at the rear of the lower part of the front frame support body (110), and comprises a left water tank mounting portion (131) and a right water tank mounting portion (132); the left water tank mounting portion (131) is located between the left side protection member (121) of the front frame and the front frame support body (110); and the right water tank mounting portion (132) is located between the right side protection member (122) of the front frame and the front frame support body (110).

3. The roller frame according to claim 2, characterized in that: The front frame support body (110) comprises: a transverse support portion (111), the transverse support portion (111) comprising a front support section (1111) and a rear support section (1112), the front support section (1111) being fixedly connected to the left side protection piece (121) of the front frame and the right side protection piece (122) of the front frame, the rear support section (1112) being connected to the rear side of the front support section (1111) and being spaced apart from the left side protection piece (121) of the front frame and the right side protection piece (122) of the front frame; A support seat front cross beam (112), comprising a left cross beam section (1121) and a right cross beam section (1122) arranged at intervals from each other in the left-right direction, the left cross beam section (1121) being connected between the left side protection piece (121) of the front frame and the rear support section (1112), the right cross beam section (1122) being connected between the right side protection piece (122) of the front frame and the rear support section (1112), the left cross beam section (1121) and the right cross beam section (1122) respectively comprising a front cross beam mounting hole (112a) for connecting to the cab; a longitudinal support portion (113) located at a rear lower side of the transverse support portion (111) and configured to connect the connection portion, the left water tank mounting portion (131) being connected between the left side protection member (121) of the front frame and the longitudinal support portion (113), and the right water tank mounting portion (132) being connected between the right side protection member (122) of the front frame and the longitudinal support portion (113); and A support seat rear cross beam (114) is spaced apart from the support seat front cross beam (112) in the front-to-rear direction and connected between the rear end of the rear support section (1112) of the transverse support portion (111) and the upper end of the longitudinal support portion (113). The support seat rear cross beam (114) includes a rear cross beam mounting hole (114a) for connecting to the cab.

4. The roller frame according to claim 3, characterized in that: The front frame left side protection piece (121) and the front frame right side protection piece (122) are hollow plates; and / or The lateral support portion (111) is a hollow plate; and / or The longitudinal support portion (113) is a hollow plate.

5. The roller frame according to claim 4, characterized in that: The front support segment (1111) comprises a front support segment hollow hole; and / or The rear support segment (1112) comprises a rear support segment hollow hole.

6. The roller frame according to claim 4, characterized in that: The front frame left side protection piece (121) or the front frame right side protection piece (122) comprises at least one front frame protection piece hollow hole, and the edge shape of at least part of the at least one front frame protection piece hollow hole is consistent with the edge shape of the front frame left side protection piece (121) or the front frame right side protection piece (122) on the corresponding side.

7. The roller frame according to claim 4, characterized in that: The longitudinal support portion (113) comprises a front assembly portion (1131), the front assembly portion (1131) being located at the lower portion of the longitudinal support portion (113), the front assembly portion (1131) comprising a front assembly portion hollow hole (1131a) and a plurality of first threaded holes, the plurality of first threaded holes being arranged at intervals around the front assembly portion hollow hole (1131a), the plurality of first threaded holes being configured to be connected to the front end of the connection portion, the left water tank mounting portion (131) being connected between the left side protection member (121) of the front frame and the front assembly portion (1131), and the right water tank mounting portion (132) being connected between the right side protection member (122) of the front frame and the front assembly portion (1131).

8. The roller frame according to claim 3, characterized in that: The support seat front cross beam (112) is configured in an L shape, comprising a transverse front cross beam plate and a longitudinal front cross beam plate, one end of the transverse front cross beam plate away from the longitudinal front cross beam plate is connected to the front frame side protection portion (120), the front cross beam mounting hole (112a) is provided on the transverse front cross beam plate, the top end of the longitudinal front cross beam plate is smoothly connected to one end of the rear support section (1112) of the transverse front cross beam plate close to the transverse support portion (111), and the bottom end of the longitudinal front cross beam plate is smoothly connected to the rear support section (1112); and / or The support seat rear cross beam (114) comprises a support plate with a groove-shaped cross section, the support plate comprises a rear cross beam mounting plate, a rear cross beam front connecting plate connected to the lower side of the front end of the rear cross beam mounting plate, and a rear cross beam rear connecting plate connected to the lower side of the rear end of the rear cross beam mounting plate, the rear cross beam mounting hole (114a) is provided on the rear cross beam mounting plate, the rear cross beam front connecting plate is smoothly connected to the rear end of the rear support section (1112) of the transverse support portion (111), and / or the rear cross beam rear connecting plate is smoothly connected to the top end of the longitudinal support portion (113); and / or The left water tank mounting portion (131) comprises a U-shaped left water tank support member, the left water tank support member comprises a first free end and a second free end, the first free end is smoothly connected to the left side protection member (121) of the front frame, and the second free end is smoothly connected to the left side of the lower part of the longitudinal support portion (113); and / or The right water tank mounting portion (132) comprises a U-shaped right water tank support member, the right water tank support member comprises a third free end and a fourth free end, the third free end is smoothly connected to the right side protection member (122) of the front frame, and the fourth free end is smoothly connected to the right side of the lower part of the longitudinal support portion (113).

9. The road roller frame according to any one of claims 1 to 8, characterized in that: The road roller rear frame (200) comprises: Fan bracket (210); A rear frame side protection part (220) comprises a rear frame left side protection piece (221) and a rear frame right side protection piece (222), wherein the fan bracket (210) is located between the upper portion of the rear frame left side protection piece (221) and the upper portion of the rear frame right side protection piece (222); and The rear frame bottom support part (230) is located between the lower part of the rear frame left side protection part (221) and the lower part of the rear frame right side protection part (222), and is configured to connect the connection part.

10. The road roller frame according to claim 9, characterized in that: The fan bracket (210) comprises a fan bracket main body (211) and a fan bracket transverse support portion (212), the fan bracket transverse support portion (212) being connected to the rear side of the fan bracket main body (211), and the fan bracket transverse support portion (212) being a hollow plate; and / or The rear frame side protection portion (220) is a hollow plate; and / or The rear frame bottom support portion (230) is a hollow plate.

11. The roller frame according to claim 10, characterized in that: The rear frame left side protection piece (221) or the rear frame right side protection piece (222) comprises at least one rear frame protection piece hollow hole, and the edge shape of at least part of the at least one rear frame protection piece hollow hole is consistent with the edge shape of the rear frame left side protection piece (221) or the rear frame right side protection piece (222) on the corresponding side.

12. The roller frame according to claim 9, characterized in that: The rear frame bottom support portion (230) comprises a rear assembly portion (231), the rear assembly portion (231) being located in the middle of the rear frame bottom support portion (230), the rear assembly portion (231) comprising a rear assembly portion hollow hole (231a) and a plurality of second threaded holes, the plurality of second threaded holes being arranged at intervals around the rear assembly portion hollow hole (231a), and the plurality of second threaded holes being configured to be connected to the rear end of the connection portion.

13. The road roller frame according to claim 9, characterized in that: The rear frame bottom support portion (230) is configured in a U shape and comprises a fifth free end and a sixth free end, the fifth free end being smoothly connected to the front side of the lower portion of the rear frame left side protection member (221), and the sixth free end being smoothly connected to the front side of the lower portion of the rear frame right side protection member (222).

14. A road roller, characterized in that: A road roller frame comprising the frame of any one of claims 1 to 13.

15. A method for manufacturing a road roller frame according to any one of claims 1 to 13, characterized in that: include: The preparation of the road roller front frame (100) and the road roller rear frame (200) comprises using a casting method to make the road roller front frame (100) and the road roller rear frame (200) integrally cast into one-piece molded parts; and The connecting portion is used to connect the front frame (100) of the road roller and the rear frame (200) of the road roller.

16. The manufacturing method according to claim 15, characterized in that: The casting method comprises: Step 10, forming a shell-type sand mold (3) based on 3D printing technology, wherein the shell-type sand mold (3) comprises a sand mold surface having a shape consistent with the front frame (100) or the rear frame (200) of the road roller, and the internal space of the shell-type sand mold (3) is configured to include a molding space having a shape consistent with the front frame (100) or the rear frame (200) of the road roller; Step 30, placing the shell sand mold (3) in a sand box, and pouring granular material (4) into the gap between the sand box and the shell sand mold (3); Step 50, pouring molten metal into the shell sand mold (3), so that a frame casting blank having the same shape as the front frame (100) or the rear frame (200) of the road roller is formed in the shell sand mold (3); Step 70, after cooling the sand box and its interior, opening the sand box and taking out the combined structure of the shell sand mold (3) and the frame casting blank; and Step 90, cooling the combined structure, taking out the frame casting, and performing surface processing on the frame casting to obtain the integrally formed front frame (100) or rear frame (200) of the road roller.

17. The manufacturing method according to claim 16, characterized in that: The step 30 further comprises: vibrating the sand box when pouring the granular material (4) into the gap between the sand box and the shell sand mold (3).

18. The manufacturing method according to claim 17, characterized in that: The step 30 also includes: adjusting the vibration frequency of the sand box so that the vibration frequency gradually increases.

19. The manufacturing method according to claim 16, characterized in that: In step 10, the wall thickness of the shell sand mold (3) is 20 mm to 100 mm.

20. The manufacturing method according to claim 16, characterized in that: In the step 30, the particulate matter (4) is a mixture of raw sand and steel balls, and the specific gravity of the raw sand and the steel balls ranges from 4.2 to 7.

2.

21. The manufacturing method according to claim 16, characterized in that: In step 50, the molten metal is molten aluminum, and the casting method is configured to adopt a low-pressure casting method; or In the step 50, the molten metal is molten iron or molten steel, and the casting method is configured to adopt a gravity casting method.

22. The manufacturing method according to claim 21, characterized in that: In step 50, the molten metal is molten aluminum, and step 50 further includes placing the sand box upside down on a sealed tank containing the molten aluminum, connecting the pouring cup of the shell sand mold (3) to a riser pipe connected to the sealed tank, introducing compressed air into the sealed tank, causing the molten aluminum to rise in the riser pipe and enter the shell sand mold (3) through the pouring cup, and maintaining the gas pressure of the compressed air after the molten aluminum fills the shell sand mold (3); wherein, In step 50, the time from when the molten aluminum enters the shell sand mold (3) to when the shell sand mold (3) is filled is controlled to be in the range of 10 to 15 seconds; and / or in step 50, the time from when the gas pressure of the compressed air is maintained is controlled to be in the range of 15 to 20 seconds.

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