Forming process for box corner supporting structural member of washing machine and box corner supporting structural member

Abstract

The invention discloses a washing machine box corner supporting structural part forming process and a box corner supporting structural part. Four box corner structures are directly formed through continuous die stamping, firstly, a convex hull structure is formed through stamping, and a reference gap is formed through shearing; with the transverse partition gaps as reference, the local outer contour I of the formed box corner structure is sheared, and meanwhile the large-size holes in the convex hull structures are sheared; cutting and forming a local outer contour II of the box corner structure by taking the gap of the beveling partition as a reference; cutting a local outer contour III of the formed box corner structure to form a complete outer contour by taking the segment gap and the side gap as reference; then punching to form a flanging of the large-size hole; then, two box corner structures at the front end of the material belt are separated from the material belt in sequence through shearing; and finally, shearing to enable the rest two box corner structures to be separated from the material belt at the same time, and cutting off waste at the front end of the material belt. Four washing machine box corner supporting structural parts are punched and formed at the same time, the punching precision is guaranteed, and the placing stability of an assembled washing machine is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of washing machines, in particular to a molding process for a washing machine box corner supporting structure and a box corner supporting structure. Background Art

[0002] The bottom structural parts of the washing machine body play a major role in bearing, especially the supporting structural parts of the bottom corners, which are often made of metal stamping structural parts with good supporting strength. Since the washing machine will generate certain vibrations when working, whether the washing machine is placed stably is an important factor affecting the user experience. Unstability can easily cause loud noises during operation, and the washing machine may shift due to working vibrations, which affects the user experience. If the washing machine is placed with four corner supports, the processing and forming accuracy of the four corner support structural parts will directly affect the stability of the washing machine after assembly. Summary of the invention

[0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a washing machine box corner support structure forming process and a box corner support structure, and simultaneously stamps and forms four washing machine box corner support structures to ensure stamping accuracy and coordination of dimensions between the four support structures, thereby ensuring the stable placement of the washing machine after assembly.

[0004] Technical solution: To achieve the above-mentioned purpose, the present invention provides a washing machine box corner support structure forming process and a box corner support structure, wherein four box corner structures are directly formed by continuous die stamping, and the four box corner structures are all of nearly triangular profiles, including a front left box corner, a front right box corner, a rear left box corner, and a rear right box corner; the specific steps of continuous stamping are as follows:

[0005] S1, stamping forming convex hull structure, shear forming reference gap, the reference gap is used to divide the forming area of ​​the four box corners, including segment gap, side gap, transverse partition gap and bevel partition gap;

[0006] S2, using the lateral partition gap as a reference, cutting the local outer contour Ⅰ of the box corner structure, and cutting the large-sized holes on the convex hull structure at the same time;

[0007] S3, using the bevel partition gap as a reference, shearing the local outer contour of the box corner structure II;

[0008] S4, small-sized holes on the shear convex hull structure;

[0009] S5. With reference to the segment gap and the side gap, the local outer contour III of the box corner structure is cut and formed to form a complete outer contour;

[0010] S6, flanging of large-sized holes by punching;

[0011] S7, cutting so that the box corner structure on the front side of the material strip is separated from the material strip;

[0012] S8, cutting so that the box corner structure on the other side of the front end of the material strip is separated from the material strip;

[0013] S9. Shearing separates the remaining two box corner structures from the material strip at the same time, and cuts off the waste material at the front end of the material strip.

[0014] Furthermore, in step S1, the segment gap and the side gap divide the material strip into a plurality of equal-length segments A along the length direction, each of the segments A is divided into two symmetrical blocks a by the transverse partition gap, and the molding structures in the two blocks a are symmetrical to each other.

[0015] Furthermore, two box corner structures are formed in each of the blocks a, the two box corner structures are installed diagonally, and the forming areas of the two box corner structures are divided by the beveled partition gap.

[0016] Furthermore, the contour line direction of the box corner structure with the ear is formed to be consistent with the length direction of the material strip; in step S1, the side gap and the lateral partition gap, the edge positions corresponding to the ear positions coincide with the preset outer edge positions of the ears.

[0017] Furthermore, in step S2, the local outer contour I is a contour line located in the middle of the section A, and at the same time, the complete contour lines of the ears of the four box corner structures are also formed.

[0018] Furthermore, in step S3, the local outer contour II is a contour line located in the middle of the block a, and a plurality of small-sized holes are formed in the plane of the molding strip.

[0019] Furthermore, in steps S2, S3, and S5, each reference gap is first matched with the positioning block sleeve of the lower die at the corresponding position to achieve the positioning of the material strip, and then the stamping action is performed.

[0020] Furthermore, in step S6, the ear edge is bent in the opposite direction at the same time, and the bending of the ear edge is achieved by making the curved outer side surface of the ear edge fit with the wheel surface during the pressing process.

[0021] Further, it comprises a flat plate portion and a convex hull portion, wherein the convex hull portion is provided with a first-order boss and a second-order boss, and the second-order boss is formed on the surface of the first-order boss;

[0022] The flat plate portion and the first-stage boss are provided with a plurality of fixing bolt matching holes;

[0023] The flat plate portion is provided with ears on the side lines parallel to the planes of the left and right side walls of the washing machine body, and the ears are used for fitting with the side walls of the washing machine body.

[0024] Furthermore, the second-order boss is a spherical curved protrusion, on which an accessory mounting hole is eccentrically arranged, and the radius of the eccentric position of the accessory mounting hole is perpendicular to the side contour edge line thereof.

[0025] Beneficial effects: The forming process of the washing machine box corner support structure and the box corner support structure of the present invention can simultaneously complete the forming process of the four box corner structures in steps through a continuous die, thereby avoiding the difference in dimensional accuracy caused by separate processing. The coordination of the dimensions of the four support structures produced at the same time is ensured, and the stability of the washing machine after assembly is ensured. Through reasonable forming steps, the force of each stamping material is ensured to be balanced, the uneven flow of the material is avoided, and the thickness of the final product is ensured to be uniform. At the same time, the number of steps is simplified, and the forming efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of a molding process of an embodiment of a molding process for a corner support structure of a washing machine box of the present invention;

[0027] Figure 2 This is a schematic diagram of the molding area divided by the molding reference gap of the present invention;

[0028] Figure 3 It is a structural schematic diagram of a box corner structure embodiment of the present invention. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the accompanying drawings.

[0030] As attached Figure 1-3 The forming process of the supporting structure of the corner of the washing machine box and the supporting structure of the corner of the box adopt continuous die stamping to directly form four corner structures, and the four corner structures are all of a near-triangular profile. The corner structure includes a flat plate portion 9 and a convex portion 10, wherein the outer contour of the flat plate portion 9 is cut into a triangular contour shape, and the convex portion is formed in the middle area of ​​the flat plate portion 9. The formed corner structure, the flat plate portion 9 is used to fit with the mounting surface on the box body, so the flatness of the flat plate portion is required to be high, and there must be no defects such as warping, wrinkling, damage and scratches; the convex portion is used to improve the strength and enhance the bearing capacity of the structural parts, and at the same time form a supporting foot structure, so that the bottom surface of the washing machine box body is lifted off the ground to avoid direct collision between the vibration of the box body and the ground during operation. Therefore, the height of the four corners of the box body from the ground depends on the molding dimensional accuracy of the convex portions of the four corner structures, and high molding accuracy is conducive to the stable placement of the chassis. Therefore, this scheme completes the molding processing of the four corner structures of the box in steps through a continuous die, avoiding the difference in dimensional accuracy caused by separate processing. The coordination of the sizes of the four supporting structural parts produced at the same time is ensured, ensuring the stability of the washing machine after assembly.

[0031] Preferably, the convex portion 10 is formed into a multi-step convex structure. In one embodiment, the convex portion 10 is provided with a first-step boss 11 and a second-step boss 12, and the second-step boss 12 is formed on the table surface of the first-step boss 11; a plurality of fixing bolt matching holes 13 are provided on the flat plate portion 9 and the first-step boss 11; wherein the first-step boss portion can be engaged with the raised portion formed on the box body, for positioning during the installation process, and on the basis of ensuring the molding accuracy, the installation accuracy is ensured by structural limiting, thereby fully ensuring the stability after installation.

[0032] The fixing bolt matching holes are used for the passage of fixing bolts, so that the flat plate part and the first-order boss part of the box corner structure are fixedly connected to the box body through reasonably distributed bolts, avoiding relative movement between the support and the box body and ensuring the stability of the connection.

[0033] Preferably, the second-order boss 12 is a spherical curved protrusion with a stronger load-bearing capacity, and an accessory mounting hole 14 is eccentrically provided thereon, which can be used to install accessories such as foot pad structures and walking rollers. The radius of the eccentric position of the accessory mounting hole 14 is perpendicular to the side contour edge line thereof, to ensure that after installation relative to the box body, the port of the accessory mounting hole 14 can be parallel to the ground, and the ports of the accessory mounting holes 14 of the four box corner structures are in the same plane, further ensuring that the stability of the washing machine body can still be maintained after the accessories are installed.

[0034] Specifically, there are four types of box corner structures, namely, front left box corner 1, front right box corner 2, rear left box corner 3, and rear right box corner 4. Among them, considering the shape and structure of common washing machines, the left and right supporting structures are symmetrical, and the front and rear supporting structures can be different, as long as the overall body is stable after installation. Of course, this solution is also applicable if the front and rear supporting structures are symmetrical or the four box corner structures are completely consistent. Considering multiple factors such as material utilization rate and the influence of material strip force on molding quality, this solution introduces reference gap as positioning reference, that is, functional holes for pre-molding positioning, so as to ensure the quality of semi-finished products and finished products after stamping in each step.

[0035] The steps of continuous stamping are as follows:

[0036] S1, stamping to form a convex hull structure, shearing to form a reference gap, the reference gap is used to divide the forming area of ​​the four box corners.

[0037] As attached Figure 2As shown in , the reference gap includes a segment gap 5, a side gap 6, a transverse partition gap 7 and a bevel partition gap 8; the segment gap 5 and the side gap 6 divide the material strip into multiple equal-length segments A along the length direction, and each segment A is divided into two symmetrical blocks a by the transverse partition gap 7, and the formed structures in the two blocks a are symmetrical to each other. Considering that the two box corner structures corresponding to the left and right sides of the washing machine box must be symmetrical structures, two structural parts, one in front and one in the back, must be formed in each block a. The symmetrical block a just happens to form two other symmetrical structural parts, one in front and one in the back, which can ensure that the impact forces borne in the width direction of the material strip during the entire stamping process are symmetrical to each other, thereby ensuring that the material flow direction is relatively uniform, avoiding the phenomenon of uneven thickness, and ensuring the flatness of the flat part and the structural strength of the convex part.

[0038] In one embodiment, the flat plate portion 9 is provided with ears 91 on the side lines parallel to the planes of the left and right side walls of the washing machine body, and the ears 91 are used to fit and install with the side walls of the washing machine body. To ensure that the molding directions when the ears are bent at the same time are consistent, they are bent upward or downward at the same time. The two box corner structures formed in each of the blocks a are set to a diagonal installation relationship, and the molding areas of the two box corner structures are divided by the bevel partition gap 8. Not only can the utilization rate of the material strip be improved to reduce costs. It can also realize the synchronous bending and molding of multiple ear structures.

[0039] Preferably, the contour line direction of the ear 91 of the box corner structure is formed to be consistent with the length direction of the material strip; in step S1, the side gap 6 and the transverse partition gap 7, the edge positions corresponding to the position of the ear 91 coincide with the preset outer edge position of the ear 91. That is, while forming the reference gap, the outermost contour line of the ear structure is directly formed. Since the ear structure is mostly an n-type contour with three sides, and the area of ​​the ear structure is small, if it is directly formed in one step, it is easy to cause a small area of ​​material to be subjected to tensile stress in three directions at the same time, so that the material in the ear forming area flows in three directions in a short time, affecting the quality of the ear. This solution helps to ensure the quality of the ear by forming the end contour of the ear and its two side contours in steps, ensuring the positioning of the ear in actual installation and the role of the ear in a stable connection with the side wall of the box.

[0040] S2. With the horizontal partition gap 7 as a reference, cut and form the local outer contour I of the box corner structure, and at the same time cut the large-sized holes on the convex hull structure. The local outer contour I is the contour line located in the middle of the section A, and at the same time, form the complete contour lines of the ears 91 of the four box corner structures. Priority is given to processing the middle part of the material strip. Since the remaining part of the material strip is relatively complete at this time, the tensile stress of the material in the middle part is relatively uniform compared to the processing on both sides, and the resulting material flow is relatively uniform, which has little effect on the thickness of the remaining material. At the same time, the connection relationship between the two side blocks a is weakened, so that in the subsequent stamping process biased towards the two side areas, the mutual stress between the materials of the two block a is weakened.

[0041] Among them, the large-sized hole is the accessory installation hole 14. Since the accessory installation holes 14 on the box corner structures in the two blocks a are completely symmetrical about the transverse partition gap 7, they are processed simultaneously, which can alleviate the flow of materials to the middle of the strip to a certain extent. At the same time, the stamping steps are reduced and the molding efficiency is improved.

[0042] S3. With the bevel partition gap 8 as a reference, cut and form the local outer contour II of the box corner structure; the local outer contour II is the contour line located in the middle of the block a, and simultaneously forms multiple small-sized holes in the plane of the material strip. After weakening the stress relationship between the two symmetrical blocks a, the areas in the middle of the two blocks a are cut at the same time to ensure the uniformity of material flow during the subsequent shearing of the outermost contour. That is, ensure that the difference in material area on both sides of each stamping and cutting position is not too large, so as to avoid uneven material flow caused by excessive stress on any side, and effectively ensure the uniformity of the thickness of the entire box corner structure. Among them, the multiple small-sized holes in the plane of the material strip are the multiple fixing bolt matching holes that need to be processed in the flat plate part of the box corner structure. These holes are just distributed on the outside of the boss part. Processing at the same time can alleviate the material flow trend to the middle of block a and achieve the effect of balancing the force.

[0043] S4. Cut small-sized holes on the convex hull structure; the small-sized holes are multiple fixing bolt matching holes required to be processed on the first-order boss. The convex hull is punched before cutting the outermost contour line because after the outer contour is completely processed and formed, the connection part between the semi-finished structural part and the material strip is already smaller. Concentrated punching of the boss part is likely to cause stress concentration in the remaining connection part, thereby causing deformation. Therefore, punching is performed first, and the outermost contour line is cut last.

[0044] S5. With reference to the segment gap 5 and the side gap 6, the local outer contour III of the box corner structure is cut and formed to form a complete outer contour.

[0045] In the above steps S2, S3, and S5, each reference gap is first matched with the positioning block sleeve of the corresponding lower die to realize the positioning of the material strip, and then the stamping action is performed. In the design of the mold, the lower concave die and the upper convex die are selected for matching, and the parts for positioning the reference gap are all the positioning of the contour line of the flat plate part, and the processing technology is all stamping and shearing forming. Preferably, the corresponding part of the concave die is set as a vertical through-slot die, which is convenient for collecting the cut waste, and the positioning block is vertically set in the vertical through-slot die, which can be just inserted and matched with the corresponding reference gap. In the feeding process, after the material strip is conveyed forward by a station distance, the formed convex hull structure is just overlapped with the lower concave die at the corresponding position, and the reference gap is just sleeved with the corresponding positioning block to realize double physical limit. On this basis, a fitting sensor can be embedded on the end face of the lower die. The clamping mechanism can be controlled through sensor feedback. The material strip can be clamped relative to the lower die in a fully fitted state, and then the upper die can press down to complete the stamping action. The multi-station linkage feedback greatly improves the positioning accuracy and the processing accuracy is further guaranteed.

[0046] S6, forming the flange of the large-sized hole by stamping; and at the same time, bending the ear edge 91 in the opposite direction. The bending of the ear edge 91 is achieved by making the bent outer side of the ear edge 91 fit with the roller surface during the pressing process. Since the ear edge structure requires no obvious crease at the bending part, the ear edge is made to fit with the roller surface during the pressing and flanging process, forcing the ear edge to bend upward under the push of the roller, and the curved surface at the bending part is smooth, and the ear edge structure is not subjected to excessive pressure and is protected.

[0047] S7, cutting so that the box corner structure on the front side of the material strip is separated from the material strip;

[0048] S8, cutting so that the box corner structure on the other side of the front end of the material strip is separated from the material strip;

[0049] S9. Shearing separates the remaining two box corner structures from the material strip at the same time, and cuts off the waste material at the front end of the material strip.

[0050] The two front-end box corner structures have fewer connected parts with the material strip in the length direction, so they are sheared and separated from the material strip one after another to ensure the quality of the finished product and avoid burrs. The remaining two box corner structures have relatively more connected parts and are not affected by the front side structure. At the same time, shearing and separation is conducive to simplifying steps and improving efficiency.

[0051] The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the above principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A forming process for a corner support structure of a washing machine box, characterized in that: Four box corner structures are directly formed by continuous die stamping. The four box corner structures are all of nearly triangular profiles, including a front left box corner (1), a front right box corner (2), a rear left box corner (3), and a rear right box corner (4). The specific steps of continuous stamping are as follows: S1, stamping forming convex hull structure, shear forming reference gap, the reference gap is used to divide the forming area of ​​the four box corners, including segment gap (5), side gap (6), transverse partition gap (7) and bevel partition gap (8); S2, using the transverse partition gap (7) as a reference, cutting the local outer contour I of the box corner structure, and cutting the large-sized holes on the convex hull structure at the same time; S3, using the bevel partition gap (8) as a reference, cutting and forming the local outer contour II of the box corner structure; S4, small-sized holes on the shear convex hull structure; S5, using the segment gap (5) and the side gap (6) as reference, cutting and forming the local outer contour III of the box corner structure to form a complete outer contour; S6, flanging of large-sized holes by punching; S7, cutting so that the box corner structure on the front side of the material strip is separated from the material strip; S8, cutting so that the box corner structure on the other side of the front end of the material strip is separated from the material strip; S9. Shearing separates the remaining two box corner structures from the material strip at the same time, and cuts off the waste material at the front end of the material strip.

2. The forming process of the washing machine box corner support structure according to claim 1, characterized in that: In step S1, the segment gap (5) and the side gap (6) divide the material strip into a plurality of equal-length segments A along the length direction, and each segment A is divided into two symmetrical blocks a by the transverse partition gap (7), and the molding structures in the two blocks a are symmetrical to each other.

3. The forming process of the corner support structure of the washing machine box according to claim 2, characterized in that: Two box corner structures are formed in each of the blocks a, the two box corner structures are installed diagonally, and the forming areas of the two box corner structures are divided by the beveled partition gap (8).

4. The forming process of the washing machine box corner support structure according to claim 3, characterized in that: The contour line direction of the box corner structure with the ear (91) is formed to be consistent with the length direction of the material strip; in step S1, the side gap (6) and the transverse partition gap (7), the edge positions corresponding to the position of the ear (91) coincide with the preset outer edge position of the ear (91).

5. The forming process of the washing machine box corner support structure according to claim 4, characterized in that: In step S2, the local outer contour I is a contour line located in the middle of the section A, and at the same time, the complete contour lines of the ears (91) of the four box corner structures are formed.

6. The forming process of the washing machine box corner support structure according to claim 5, characterized in that: In step S3, the local outer contour II is a contour line located in the middle of the block a, and a plurality of small-sized holes are formed in the plane of the molding strip.

7. The forming process of the washing machine box corner support structure according to claim 6, characterized in that: In steps S2, S3, and S5, each reference gap is first matched with the positioning block sleeve of the lower die at the corresponding position to realize the positioning of the material strip, and then the stamping action is performed.

8. The forming process of the washing machine box corner support structure according to claim 7, characterized in that: In step S6, the ear edge (91) is bent in the opposite direction at the same time. The bending of the ear edge (91) is achieved by making the curved outer side surface of the ear edge (91) fit with the wheel surface during the pressing process.

9. The box corner supporting structure obtained by the molding process of the washing machine box corner supporting structure according to any one of claims 1 to 8, characterized in that: It comprises a flat plate portion (9) and a convex portion (10), wherein the convex portion (10) is provided with a first-order boss (11) and a second-order boss (12), and the second-order boss (12) is formed on the surface of the first-order boss (11); The flat plate portion (9) and the first-stage boss (11) are provided with a plurality of fixing bolt matching holes (13); The flat plate portion (9) is provided with ears (91) on the side lines parallel to the planes of the left and right side walls of the washing machine housing, and the ears (91) are used for fitting with the side walls of the washing machine housing.

10. The box corner supporting structure obtained by the molding process of the washing machine box corner supporting structure according to claim 9, characterized in that: The second-order boss (12) is a spherical curved surface protrusion, on which an accessory mounting hole (14) is eccentrically arranged, and the radius of the eccentric position of the accessory mounting hole (14) is perpendicular to the side contour edge line thereof.

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