A spiral blade forming die, a forming assembly, a forming mechanism and a forming process

Abstract

The present application relates to a kind of spiral blade forming die, forming assembly, forming mechanism and forming process, spiral blade forming die includes upper die seat, lower die seat, top piece and pressure piece, lower die seat is below upper die seat, the upper surface of lower die seat forms lower pressure plane, first lower pressure helical surface and second lower pressure helical surface sequentially adjacent arrangement, first lower pressure helical surface and second lower pressure helical surface between reserved assembly interval, top piece can be driven to be installed in assembly interval, top piece upper end surface is formed with third lower pressure helical surface, third lower pressure helical surface can be respectively with first lower pressure helical surface and second lower pressure helical surface docking to form lower pressure helical surface;Upper die seat lower surface forms upper pressure helical surface, and upper die nitrogen gas spring and first mover are equipped on upper die seat, pressure piece is installed in upper die nitrogen gas spring free end, and the lower surface of pressure piece forms upper pressure plane, and upper pressure plane can be docked to form upper pressure surface with upper pressure helical surface.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of agricultural machinery, and particularly relates to a spiral blade forming die, a forming assembly, a forming mechanism and a forming process. BACKGROUND

[0002] In recent years, in most areas of China, crops are harvested by using harvesting machines, which is an effective method to greatly improve the utilization rate of harvesting machines. In recent years, the large-scale of harvesting machines has become an irresistible trend, whether it is the grain and corn harvesting machine market or the economic crop harvesting machine market, the demand structure adjustment is directed to large-scale. As one of the core components of large-scale harvesting machines, the manufacturing process and precision of the feeding blade in the axial flow cylinder assembly are very critical.

[0003] The blade is located at the feeding part of the front end of the axial flow cylinder assembly, the blade is spiral, and the circumference is welded on the surface of the feeding cone. The grain in the machine body is screened and distributed, so the forming efficiency of the blade and the importance of the precision of the part gradually emerge.

[0004] The spiral blade is also called spiral blade, which is in the shape of inner and outer spiral. A plurality of spiral blades are welded together to form a continuous spiral, which is the main accessory of the spiral conveyor. The spiral blade has a long history and various processing methods, which are the methods summarized by predecessors through a lot of practice and the crystallization of wisdom of predecessors. In terms of processing methods, there are generally the following several kinds: die pressing, stretching and extrusion.

[0005] I. Die pressing. It is also a kind of casting. A model of the spiral blade to be made is made, then the pouring material is selected, and finally the finished spiral part is obtained. This method has good production cost and is only suitable for mass production. Therefore, the application of this method is not very common.

[0006] II. Hydraulic stretching method. A ring is obtained by cutting a steel plate to the calculated size, then a slit is cut on the ring, and the two sides of the ring are tightened by using a prefabricated clamp. Start the hydraulic cylinder to make the two sides of the ring move up and down and separate. After stretching to a certain extent, measure the pitch of the spiral blade according to the size. The measured pitch is greater than the actual pitch because the steel plate will shrink to a certain extent after the hydraulic cylinder is loosened. After obtaining the correct pitch, the required spiral blade is obtained. This method is widely used, does not require a mold, and has a faster processing speed. It is still widely used today. The disadvantage is that the shape of the stretched spiral is irregular, and the size error of the spiral is relatively large.

[0007] III. Extrusion method. This method is similar to die pressing, which is an improved pressing method. Before making a spiral part, a set of molds with the same size as the finished product needs to be made. The mold is divided into two parts with the same shape and size, which are placed on the upper and lower parts of the press, then the ring filled with material is placed on the mold, and the press is started. The upper and lower molds are pressed together, and the steel plate is correspondingly changed into a spiral shape, but there are problems of poor forming surface accuracy and profile accuracy. SUMMARY

[0008] In order to solve one or several of the technical problems existing in the prior art, the present application provides a spiral blade forming die, a forming assembly, a forming mechanism and a forming process.

[0009] The technical scheme for solving the above technical problems is as follows: a spiral blade forming die, comprising an upper die seat, a lower die seat, a top piece and a pressing piece, the lower die seat is located below the upper die seat, the upper surface of the lower die seat is formed with a lower pressing flat surface, a first lower pressing spiral surface and a second lower pressing spiral surface arranged in sequence, a fitting interval is reserved between the first lower pressing spiral surface and the second lower pressing spiral surface, the top piece can be driven up and down and installed in the fitting interval, the upper end surface of the top piece is formed with a third lower pressing spiral surface, and the third lower pressing spiral surface can be respectively butted with the first lower pressing spiral surface and the second lower pressing spiral surface to form a lower pressing spiral surface.

[0010] The lower surface of the upper die seat is formed with an upper pressing spiral surface, the upper die nitrogen gas spring and a leader are arranged on the upper die seat, the pressing piece is installed at the free end of the upper die nitrogen gas spring, the lower surface of the pressing piece is formed with an upper pressing flat surface, and the upper pressing flat surface can be butted with the upper pressing spiral surface to form an upper pressing surface; the upper pressing flat surface and the lower pressing flat surface are arranged oppositely, the upper pressing spiral surface and the lower pressing spiral surface are arranged oppositely, and the leader is located on one side of the upper pressing spiral surface and arranged oppositely to the top piece.

[0011] The spiral blade forming die of the present application can stamp and form the plate to be formed, can better realize the size accuracy of the part, and has obvious advantages compared with traditional manual shaping and simple tool forming.

[0012] On the basis of the above technical scheme, the present application can also be improved as follows.

[0013] Further, the two sides of the third lower pressing spiral surface of the top piece are respectively provided with first positioning protrusions.

[0014] The beneficial effects of the above further scheme are that the first positioning protrusions can be used to initially position the two sides of the plate to be formed, so as to avoid fluctuation of the plate to be formed during the forming process.

[0015] Further, two sides of the lower pressing flat surface of the lower die seat and an end away from the first lower pressing helical surface are respectively provided with second positioning protrusions.

[0016] The beneficial effect of the above further scheme is that the second positioning protrusions can initially position one end of the plate to be formed and positions close to the two sides of the one end.

[0017] Further, the upper die seat is further provided with a limiting screw, the pressing device is provided with a reverse T-shaped limiting hole, the limiting screw passes through the limiting hole and the head of the limiting screw can be matched with the limiting step of the limiting hole.

[0018] The beneficial effect of the above further scheme is that the limiting screw and the reverse T-shaped limiting hole can limit the pressing device to avoid the pressing device from being separated from the upper die seat.

[0019] Further, the lower surface of the upper die seat is formed with an assembly cavity, the upper die nitrogen spring is installed at the bottom of the assembly cavity, and the pressing device can be installed in the assembly cavity and can slide up and down.

[0020] The beneficial effect of the above further scheme is that the assembly cavity can provide a containing space for the pressing device.

[0021] Further, the side wall of the assembly cavity is provided with a first guide mechanism, the outer peripheral side wall of the pressing device is provided with a second guide mechanism, and the first guide mechanism and the second guide mechanism cooperate to make the pressing device move up and down and in and out of the assembly cavity.

[0022] The beneficial effect of the above further scheme is that the cooperation of the two guide mechanisms facilitates the up-and-down movement of the pressing device for stamping action.

[0023] Further, the lower surface of the upper die seat is further provided with an upper die limiting plate, the upper die limiting plate extends into the lower part of the assembly cavity and is matched with the outer peripheral side wall of the pressing device for limiting.

[0024] The lower surface of the upper die seat is further provided with a first reverse side guide plate, the upper surface of the lower die seat is provided with a second reverse side guide plate, the first reverse side guide plate has a first reverse side, the second reverse side guide plate has a second reverse side, the first reverse side faces away from the end of the lower pressing helical surface, and when the upper die seat and the lower die seat are closed, the first reverse side and the second reverse side are in contact and extruded.

[0025] The beneficial effect of the above further scheme is that the upper die limiting plate can further limit the pressing device, and the cooperation of the two reverse side guide plates can offset the lateral force generated during the molding of the mold to ensure the balance of the internal force of the mold and prevent the mold from moving.

[0026] Further, the lower surface of the upper die seat is provided with a vertically arranged guide column, and the upper surface of the lower die seat is provided with a guide groove, the guide column is adapted to be inserted into the guide groove to guide the up-down movement between the upper die seat and the lower die seat.

[0027] The beneficial effect of the further scheme is that the guide column and the guide groove cooperate to realize the up-down guiding movement between the upper die seat and the lower die seat.

[0028] A spiral blade forming assembly comprising the spiral blade forming die, further comprising a spiral blade secondary shaping die;

[0029] The spiral blade secondary shaping die comprises an upper module, a lower module and a top piece block, the lower module is located below the upper module, the lower surface of the upper module has an upper spiral blade forming surface, the upper surface of the lower module has a first lower spiral blade forming surface, the top piece block can be driven to move up and down and is arranged in the accommodating cavity of the lower module, the upper surface of the top piece block has a second lower spiral blade forming surface, the second lower spiral blade forming surface can be connected with the first lower spiral blade forming surface to form a lower spiral blade forming surface; wherein the upper spiral blade forming surface and the lower spiral blade forming surface are arranged oppositely.

[0030] Further, the lower surface of the upper module is further provided with a first reverse side plate, the upper surface of the lower module is provided with a second reverse side plate, the first reverse side plate has a first limiting surface, the second reverse side plate has a second limiting surface, the first limiting surface faces away from one side of the starting end of the lower spiral blade forming surface, when the upper module and the lower module are clamped, the first limiting surface and the second limiting surface are in contact and extruded.

[0031] A spiral blade forming mechanism comprising the spiral blade forming die, further comprising a first machine tool top rod and a first driving mechanism, the first machine tool top rod passes through the lower die seat from bottom to top and is connected with the bottom of the top piece block, and the driving end of the first driving mechanism is connected with the upper die seat and drives the upper die seat to move up and down.

[0032] The spiral blade forming mechanism has the beneficial effects that it is not only suitable for the stamping forming scheme of thick plate curved surface twisted parts, but also suitable for thin plate materials, and can well improve the precision of stamping forming.

[0033] The spiral blade forming mechanism comprises the spiral blade forming assembly, and further comprises a first machine tool ejector rod, a first driving mechanism, a second machine tool ejector rod and a second driving mechanism.

[0034] The spiral blade forming process is realized by using the spiral blade forming mechanism, and comprises the following steps: placing one end of a plate to be formed on a lower pressing plane, placing the middle part of the plate to be formed on the ejector, driving the upper die seat downward by using the driving mechanism, gradually approaching and contacting the upper pressing plane on the upper die seat to one end of the plate to be formed, contacting and extruding the ejector by the forerunner to make the third lower pressing helical surface abut against the first lower pressing helical surface and the second lower pressing helical surface respectively, gradually approaching and contacting the upper pressing helical surface to the middle part and the other end of the plate to be formed, and extruding the middle part and the other end of the plate to be formed by using the upper pressing helical surface and the lower pressing helical surface, so that a partially formed plate to be shaped is obtained.

[0035] The spiral blade forming process has the advantages that the spiral blade forming process is suitable for the forming of various carbon steel materials and has high forming precision under the condition that the tonnage of the press is allowed.

[0036] The spiral blade forming process is realized by using the spiral blade forming mechanism, and comprises the following steps: placing one end of a plate to be formed on a lower pressing plane, placing the middle part of the plate to be formed on the ejector, driving the upper die seat downward by using the first driving mechanism, gradually approaching and contacting the upper pressing plane on the upper die seat to one end of the plate to be formed, contacting and extruding the ejector by the forerunner to make the third lower pressing helical surface abut against the first lower pressing helical surface and the second lower pressing helical surface respectively, gradually approaching and contacting the upper pressing helical surface to the middle part and the other end of the plate to be formed, and extruding the middle part and the other end of the plate to be formed by using the upper pressing helical surface and the lower pressing helical surface, so that a partially formed plate to be shaped is obtained.

[0037] The forming part of the partially formed plate to be shaped is placed on the second lower helical blade forming surface on the upper surface of the ejector block, the upper die block is driven downward by using the second driving mechanism, the upper helical blade forming surface on the upper die block contacts and presses the second lower helical blade forming surface, and the ejector block is driven to move downward, until the second lower helical blade forming surface abuts against the first lower helical blade forming surface, so that the unformed part of the plate to be shaped is extruded and formed between the first lower helical blade forming surface and the upper helical blade forming surface, and a formed spiral blade is obtained. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 Fig. 1 is a schematic diagram of the three-dimensional structure of the lower die base of the present application;

[0039] Figure 2 Fig. 2 is a schematic diagram of the three-dimensional structure of the top piece device of the present application;

[0040] Figure 3 Fig. 3 is a schematic diagram of the three-dimensional structure of the upper die base of the present application;

[0041] Figure 4 Fig. 4 is a schematic diagram of the three-dimensional structure of the pressing device of the present application;

[0042] Figure 5 Fig. 5 is a schematic diagram of the three-dimensional structure of the upper die base and the lower die base of the present application;

[0043] Figure 6 Fig. 6 is a schematic diagram of the three-dimensional structure of the upper die module and the lower die module of the present application;

[0044] Figure 7 Fig. 7 is a schematic diagram of the three-dimensional structure of the lower die module of the present application;

[0045] Figure 8 Fig. 8 is a schematic diagram of the three-dimensional structure of the top piece block of the present application;

[0046] Figure 9 Fig. 9 is a schematic diagram of the three-dimensional structure of the upper die module of the present application.

[0047] In the drawings, the components represented by the respective reference numerals are listed as follows:

[0048] 100, upper die base; 101, upper pressing helical surface; 102, upper pressing flat surface; 103, upper die nitrogen gas spring; 104, first mover; 105, limit screw; 106, assembly cavity; 107, first guide mechanism; 108, second guide mechanism; 109, upper die limit plate; 110, first reverse side guide plate; 111, first reverse side surface; 112, guide column;

[0049] 200, lower die base; 201, lower pressing flat surface; 202, first lower pressing helical surface; 203, second lower pressing helical surface; 204, second positioning protrusion; 205, second reverse side guide plate; 206, second reverse side surface; 207, guide slot;

[0050] 300, top piece device; 301, third lower pressing helical surface; 302, first positioning protrusion;

[0051] 400, pressing device; 500, first machine tool top rod;

[0052] 600. Upper module; 601. Upper helical blade forming surface; 602. First reverse side plate; 603. First limiting surface; 605. Upper mold insert; 606. Clearance groove; 607. Guide block;

[0053] 700. Lower module; 701. Top block; 702. First lower helical blade forming surface; 703. Second lower helical blade forming surface; 704. Receiving cavity; 705. Second reverse side plate; 706. Second limiting surface; 707. Positioning block; 708. First guide; 709. Second guide; 710. Guide cavity; 711. Top rod pad; 712. Limiting plate. Detailed Implementation

[0054] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0055] Example 1

[0056] like Figures 1-5 As shown, a spiral blade forming mold of this embodiment includes an upper mold base 100, a lower mold base 200, an ejector 300, and a clamping device 400. The lower mold base 200 is located below the upper mold base 100. The upper surface of the lower mold base 200 is formed with a lower clamping plane 201, a first lower clamping spiral surface 202, and a second lower clamping spiral surface 203 arranged adjacent to each other in sequence. An assembly gap is reserved between the first lower clamping spiral surface 202 and the second lower clamping spiral surface 203. The ejector 300 can be driven up and down and installed in the assembly gap. The upper end surface of the ejector 300 is formed with a third lower clamping spiral surface 301. The third lower clamping spiral surface 301 can be connected with the first lower clamping spiral surface 202 and the second lower clamping spiral surface 203 to form a lower clamping spiral surface.

[0057] The lower surface of the upper mold base 100 has an upper clamping spiral surface 101. The upper mold base 100 is provided with an upper mold nitrogen spring 103 and a pilot device 104. The pressing device 400 is installed at the free end of the upper mold nitrogen spring 103. The lower surface of the pressing device 400 has an upper clamping plane 102. The upper clamping plane 102 can mate with the upper clamping spiral surface 101 to form an upper clamping surface. The upper clamping plane 102 and the lower clamping plane 201 are arranged vertically opposite each other and have the same shape and structure. The upper clamping spiral surface 101 and the lower clamping spiral surface are arranged vertically opposite each other and have the same shape and structure. The pilot device 104 is located on one side of the upper clamping spiral surface 101 and is arranged vertically opposite to the ejector device 300.

[0058] like Figure 1 and Figure 2As shown, the third lower pressing helical surface 301 of the top piece 300 of the embodiment is provided with a first positioning protrusion 302 on each side. The first positioning protrusion can be used to initially position the two sides of the plate to be formed, avoiding fluctuations in the plate to be formed during the forming process.

[0059] As shown, Figure 1 The lower pressing surface 201 of the lower die seat 200 of the embodiment is provided with a second positioning protrusion 204 on each side and at the end away from the first lower pressing helical surface 202. The second positioning protrusion can be used to initially position the end of the plate to be formed and the positions close to the two sides of the end.

[0060] As shown, Figure 3 and Figure 4 The upper die seat 100 of the embodiment is also provided with a limiting screw 105, and the pressing piece 400 is provided with a reverse T-shaped limiting hole. The limiting screw 105 passes through the limiting hole and the head of the limiting screw 105 can be adapted to the limiting step of the limiting hole. The limiting screw and the reverse T-shaped limiting hole can limit the pressing piece, avoiding the pressing piece from being detached from the upper die seat.

[0061] As shown, Figure 3 The lower surface of the upper die seat 100 of the embodiment is formed with an assembly cavity 106, and the upper die nitrogen gas spring 103 is installed at the bottom of the assembly cavity 106. The pressing piece 400 can slide up and down in the assembly cavity 106. The assembly cavity can provide a containing space for the pressing piece.

[0062] As shown, Figure 3 and Figure 4 The side wall of the assembly cavity 106 of the embodiment is provided with a first guide mechanism 107, and the outer peripheral side wall of the pressing piece 400 is provided with a second guide mechanism 108. The first guide mechanism 107 and the second guide mechanism 108 cooperate to make the pressing piece 400 move up and down and in and out of the assembly cavity 106. The cooperation of the two guide mechanisms facilitates the up and down movement of the pressing piece for stamping action.

[0063] As shown, Figure 3As shown, the lower surface of the upper die holder 100 is further provided with an upper die limiting plate 109 which extends into the lower part of the assembly cavity 106 and is limited by the outer peripheral sidewall of the presser 400; the lower surface of the upper die holder 100 is further provided with a first reverse side guide plate 110, and the upper surface of the lower die holder 200 is provided with a second reverse side guide plate 205, the first reverse side guide plate 110 has a first reverse side 111, and the second reverse side guide plate 205 has a second reverse side 206, the first reverse side 111 faces away from the side of the lower pressing helical surface end, and when the upper die holder 100 and the lower die holder 200 are closed, the first reverse side 111 and the second reverse side 206 are in contact and extrusion. The upper die limiting plate can further limit the presser, and the two reverse side guide plates can offset the lateral force generated by the mold forming, ensure the balance of the internal force of the mold, and prevent the mold from moving.

[0064] As shown in Figure 1 and Figure 3 As shown, the lower surface of the upper die holder 100 is provided with a vertically arranged guide column 112, and the upper surface of the lower die holder 200 is provided with a guide groove 207, and the guide column 112 is inserted into the guide groove 207 to realize the up-and-down movement of the upper die holder 100 and the lower die holder 200. The guide column and the guide groove cooperate to realize the up-and-down guide movement between the upper die holder and the lower die holder.

[0065] Wherein, the lower die insert can be arranged in the lower die seat 200, and the lower pressing flat surface 201, the first lower pressing helical surface 202, the second lower pressing helical surface 203 and the top piece 300 are arranged on the lower die insert. The lower die seat 200 can bear the lower die insert, the top piece and the like. The top piece 300 can ensure the stability of the initial state of the plate to be formed, and can also cooperate with the upper die nitrogen spring 103 in the forming process to ensure the simultaneous forming of the blade profile of the plate to be formed. The top piece 300 can use the lower die nitrogen spring arranged at the bottom thereof as a power source, or can use the first machine tool ejector pin 500 as a power source. The function of the first machine tool ejector pin 500 is to gradually return the top piece 300 to the original position during the forming process of the plate to be formed, until the third lower pressing helical surface 301 is connected with the first lower pressing helical surface 202 and the second lower pressing helical surface 203 to form a lower pressing helical surface. The upper die insert is also arranged on the upper die seat 100, and the upper pressing helical surface 101 is arranged on the upper die insert. The upper die insert can cooperate with the lower die insert, so that the plate to be formed can meet the requirements of the drawing. The upper die nitrogen spring acts on the pressing piece 400 to press the plate to be formed, thereby ensuring the stability and reliability of the plate to be formed during the forming process. The limiting screw 105 can limit the ejection stroke of the upper die nitrogen spring, so as to ensure that the pressing time and the pressing stroke of the pressing piece 400 are operated according to the state set by the mold. The main function of the pressing piece is to cooperate with the helical surface on the upper surface of the lower die insert to firmly press the plate to be formed in the initial stage of the forming process, so as to ensure that the plate to be formed is always positioned stably and reliably during the forming process.

[0066] The spiral blade forming mold of the embodiment can perform stamping forming on the plate to be formed, can better realize the size precision of the part, and also maintains a certain stability, and has obvious advantages compared with the traditional manual correction and simple tool forming. The forming mold adopts experimental blocks, which can reduce the mold debugging cost, accelerate the mold debugging progress and shorten the mold manufacturing cycle.

[0067] The embodiment also provides a spiral blade forming mechanism, which comprises the spiral blade forming mold, and further comprises a first machine tool ejector pin 500 and a driving mechanism. The first machine tool ejector pin 500 passes through the lower die seat 200 from bottom to top and is connected with the bottom of the top piece 300. The driving end of the driving mechanism is connected with the upper die seat 100 and drives the upper die seat 100 to move up and down.

[0068] The spiral blade forming mechanism of the embodiment is not only suitable for the stamping forming scheme of thick plate curved surface distortion parts, but also suitable for thin plate, and can better improve the precision of stamping forming.

[0069] The embodiment also provides a spiral blade forming process, which is realized by using the spiral blade forming mechanism and includes the following steps: placing one end of a to-be-formed plate on the lower pressing plane 201, placing the middle part of the to-be-formed plate on the top piece device 300, driving the upper die seat 100 to move downward by using the driving mechanism, the upper pressing plane 102 on the upper die seat 100 gradually approaches and contacts the one end of the to-be-formed plate, the forerunner 104 contacts and extrudes the top piece device 300 to make the third lower pressing spiral surface 301 respectively butt against the first lower pressing spiral surface 202 and the second lower pressing spiral surface 203, the upper pressing spiral surface 101 gradually approaches and contacts the middle part and the other end of the to-be-formed plate, and the forming of the middle part and the other end of the to-be-formed plate is completed by extrusion of the upper pressing spiral surface 101 and the lower pressing spiral surface in opposite directions, so that a partially formed to-be-shaped plate, i.e., a plate with a partially spiral structure, is obtained.

[0070] In the embodiment, the to-be-formed plate can have a circular ring structure with a fracture.

[0071] The spiral blade forming process of the embodiment is suitable for the forming of curved surfaces of various carbon steel materials and has high forming precision, under the condition that the tonnage of a press is allowed.

[0072] Embodiment 2

[0073] As shown in Figures 1-9 , the embodiment provides a spiral blade forming assembly, which includes the spiral blade forming die in embodiment 1 and further includes a spiral blade secondary shaping die.

[0074] As shown in Figures 6-9 , the spiral blade secondary shaping die in the embodiment includes an upper die block 600, a lower die block 700 and a top piece block 701, the lower die block 700 is located below the upper die block 600, the lower surface of the upper die block 600 has an upper spiral blade forming surface 601, the upper surface of the lower die block 700 has a first lower spiral blade forming surface 702, the top piece block 701, which can be driven to move up and down, is arranged in a containing cavity 704 of the lower die block 700, the upper surface of the top piece block 701 has a second lower spiral blade forming surface 703, and the second lower spiral blade forming surface 703 can butt against the first lower spiral blade forming surface 702 to form a lower spiral blade forming surface; wherein the upper spiral blade forming surface 601 and the lower spiral blade forming surface are arranged in opposite directions and have the same shape structure. The second lower spiral blade forming surface 703 is a spiral structure with the same shape as the lower pressing spiral surface.

[0075] As shown in Figure 7 and Figure 9As shown, the lower surface of the upper module 600 of the embodiment is further provided with a first reverse side plate 602, and the upper surface of the lower module 700 is provided with a second reverse side plate 705. The first reverse side plate 602 has a first limiting surface 603, and the second reverse side plate 705 has a second limiting surface 706. The first limiting surface 603 is directed to a side away from the starting end of the lower helical blade forming surface, and the first limiting surface 603 and the second limiting surface 706 are in contact and extrusion when the upper module 600 and the lower module 700 are closed. By providing the first reverse side plate and the second reverse side plate, the lateral force generated by the mold forming can be offset by the cooperation of the two reverse side plates, so as to ensure the force balance inside the mold and prevent the mold from moving.

[0076] As shown, Figure 7 As shown, the upper surface of the lower module 700 of the embodiment is further provided with a limiting plate 712 which extends into the lower part of the accommodating cavity 704 and is limited by the outer peripheral side wall of the top piece block 701. The limiting plate is provided to prevent the top piece block from being pulled out of the accommodating cavity.

[0077] As shown, Figure 8 As shown, the two sides of the second lower helical blade forming surface 703 of the top piece block 701 of the embodiment are respectively provided with a positioning block 707. The positioning block is provided to ensure the final profile accuracy of the helical blade.

[0078] As shown, Figure 9 As shown, the lower surface of the upper module 600 of the embodiment is provided with an upper mold insert 605, and the lower surface of the upper mold insert 605 has the upper helical blade forming surface 601. The lower surface of the upper mold insert 605 is further provided with an avoiding groove 606 which is located on the two sides of the upper helical blade forming surface 601 and is arranged in correspondence with the positioning block 707. The avoiding groove is provided to avoid the positioning block, so as to ensure the stamping fit.

[0079] As shown, Figure 7 and Figure 8 As shown, the side wall of the accommodating cavity 704 is provided with a first guide 708, and the outer peripheral side wall of the top piece block 701 is provided with a second guide 709. The first guide 708 and the second guide 709 cooperate to enable the top piece block 701 to move up and down and in and out of the accommodating cavity 704. The two guides cooperate to facilitate the up-and-down movement of the top piece block.

[0080] As shown, Figure 7 and Figure 9As shown, the lower surface of the upper module 600 of the embodiment is provided with vertically arranged guide blocks 607, and the upper surface of the lower module 700 is provided with guide cavities 710, the guide blocks 607 are adapted to be inserted into the guide cavities 710 to guide the up-and-down movement between the upper module 600 and the lower module 700. The guide blocks and the guide cavities cooperate to achieve the up-and-down guiding movement between the upper die seat and the lower die seat.

[0081] As shown, the upper spiral vane forming surface 601 of the embodiment is a helical structure with the same shape as the lower spiral vane forming surface. Figures 7-9 As shown, the bottom surface of the top piece block 701 is provided with a plurality of top rod pads 711.

[0082] Specifically, the lower module 700 of the embodiment is mainly used to carry the lower die insert and the top piece block 701. The upper surface of the lower die insert is provided with a first lower spiral vane forming surface 702, and the lower die insert cooperates with the top piece block 701 to perform secondary shaping on the partially formed spiral vane. The top piece block 701 is used to support the spiral forming part of the partially formed spiral vane, and cooperates with the upper die insert to press the formed part of the spiral vane during the entire secondary shaping process.

[0083] The spiral vane secondary shaping die of the embodiment can realize secondary shaping on the partially formed spiral vane by arranging the upper module, the lower module and the top piece block, and further ensures the spiral vane forming surface precision. The process scheme of press forming is adopted, which is suitable for the curved surface forming of various carbon steel materials under the condition that the tonnage of the press is allowed.

[0084] The embodiment also provides a spiral vane forming mechanism, which comprises the spiral vane forming assembly of the embodiment, and further comprises a first machine tool top rod 500, a first driving mechanism, a second machine tool top rod, and a second driving mechanism. The first machine tool top rod 500 passes through the lower die seat from bottom to top and is connected with the bottom of the top piece 300. The driving end of the first driving mechanism is connected with the upper die seat 100 and drives the upper die seat 100 to move up and down. The second machine tool top rod passes through the lower module 700 from bottom to top and is connected with the bottom of the top piece block 701. The driving end of the second driving mechanism is connected with the upper module 600 and drives the upper module 600 to move up and down.

[0085] The spiral vane forming mechanism of the embodiment is not only suitable for the press forming scheme of the curved surface distortion part of the thick plate material, but also suitable for the thin plate material, and can well improve the shaping precision of the partially formed spiral vane. The positioning block is used for positioning after the press forming, which can avoid the fluctuation in the forming process of the parts.

[0086] The embodiment also provides a spiral blade forming process. One end of a to-be-formed plate is placed on the lower pressing plane 201, the middle part of the to-be-formed plate is placed on the top piece 300, the upper die seat 100 is driven to move downward by the driving mechanism, the upper pressing plane 102 on the upper die seat 100 gradually approaches and contacts the one end of the to-be-formed plate, the forerunner 104 contacts and extrudes the top piece 300 to make the third lower pressing spiral surface 301 respectively butt against the first lower pressing spiral surface 202 and the second lower pressing spiral surface 203, the upper pressing spiral surface 101 gradually approaches and contacts the middle part and the other end of the to-be-formed plate, and the forming of the middle part and the other end of the to-be-formed plate is completed by extrusion of the upper pressing spiral surface 101 and the lower pressing spiral surface, and a partially formed to-be-shaped plate is obtained.

[0087] The formed part of the partially formed to-be-shaped plate is placed on the second lower spiral blade forming surface 703 on the upper surface of the top piece block 701 (the formed part of the partially formed to-be-shaped plate is attached to the second lower spiral blade forming surface 703, and the unformed part is in a flat plate structure), the upper die module 600 is driven to move downward by the driving mechanism, the upper spiral blade forming surface 601 on the upper die module 600 contacts and presses the second lower spiral blade forming surface 703, and the top piece block 701 is driven to move downward, until the second lower spiral blade forming surface 703 butts against the first lower spiral blade forming surface 702, so that the unformed part of the to-be-shaped plate is extruded and formed between the first lower spiral blade forming surface 702 and the upper spiral blade forming surface 601.

[0088] The spiral blade forming process of the embodiment first performs one-time partial forming on the to-be-formed plate, and then performs two-time shaping on the partially formed spiral blade, so that the forming precision is high. The spiral blade forming process of the embodiment is not only suitable for the stamping forming scheme of thick plate curved surface distortion parts, but also suitable for thin plate. Through the process scheme of pressing forming, the curved surface forming of various carbon steel materials is suitable in the case that the tonnage of the press is allowed. Through the process of two-time shaping or multi-sequence separate pressing forming, the positioning of the parts in the forming process and the controlled forming process are ensured. The experimental block (castings or 45 steel) is used in the forming process, so that the mold debugging cost is reduced, the mold debugging progress is accelerated, and the mold manufacturing cycle is shortened.

[0089] In the description of the application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0090] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0091] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0092] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0093] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0094] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and the person skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. A spiral vane forming die characterized by, The application relates to a spiral blade forming die, which comprises an upper die base, a lower die base, a top piece and a pressing piece, the lower die base is arranged below the upper die base, the upper surface of the lower die base is formed with a lower pressing flat surface, a first lower pressing helical surface and a second lower pressing helical surface which are arranged in sequence and are adjacent to each other, an assembly interval is reserved between the first lower pressing helical surface and the second lower pressing helical surface, the top piece can be driven up and down and is mounted in the assembly interval, the upper end surface of the top piece is formed with a third lower pressing helical surface which can be connected with the first lower pressing helical surface and the second lower pressing helical surface respectively to form a lower pressing helical surface; the lower surface of the upper die base is formed with an upper pressing helical surface, the upper die base is provided with an upper die nitrogen spring and a leader, the pressing piece is mounted at the free end of the upper die nitrogen spring, the lower surface of the pressing piece is formed with an upper pressing flat surface which can be connected with the upper pressing helical surface to form an upper pressing surface; the upper pressing flat surface and the lower pressing flat surface are arranged oppositely, the upper pressing helical surface and the lower pressing helical surface are arranged oppositely, and the leader is arranged on one side of the upper pressing helical surface and is arranged oppositely to the top piece.

2. The helical vane forming die of claim 1, wherein The two sides of the third lower pressing helical surface of the top piece are respectively provided with first positioning protrusions.

3. The helical vane forming die of claim 1, wherein The two sides of the lower pressing flat surface of the lower die base and one end away from the first lower pressing helical surface are respectively provided with second positioning protrusions.

4. The helical vane forming die of claim 1 wherein, The upper die base is further provided with a limiting screw, the pressing piece is provided with a reverse T-shaped limiting hole, the limiting screw is arranged through the limiting hole and the head of the limiting screw can be matched with the limiting step of the limiting hole.

5. The helical vane forming die of claim 1 wherein, The lower surface of the upper die base is formed with an assembly cavity, the upper die nitrogen spring is mounted at the bottom of the assembly cavity, and the pressing piece is mounted in the assembly cavity and can slide up and down.

6. The helical vane forming die of claim 5, wherein A first guide mechanism is arranged on the side wall of the assembly cavity, a second guide mechanism is arranged on the outer circumferential side wall of the pressing piece, and the first guide mechanism and the second guide mechanism are matched to enable the pressing piece to move up and down and in and out of the assembly cavity.

7. The helical vane forming die of claim 5 wherein, The lower surface of the upper die base is further provided with an upper die limiting plate which extends below the assembly cavity and is matched with the outer circumferential side wall of the pressing piece to limit; The lower surface of the upper die base is further provided with a first reverse side guide plate, the upper surface of the lower die base is provided with a second reverse side guide plate, the first reverse side guide plate has a first reverse side, the second reverse side guide plate has a second reverse side, the first reverse side faces one side away from the end of the lower pressing helical surface, and when the upper die base and the lower die base are closed, the first reverse side and the second reverse side are in contact and extruded.

8. The helical vane forming die of claim 1 wherein, The lower surface of the upper die base is provided with a vertically arranged guide column, the upper surface of the lower die base is provided with a guide groove, the guide column is matched and inserted into the guide groove to guide the up and down movement between the upper die base and the lower die base.

9. A screw flight forming assembly, characterized by, The application further relates to a spiral blade secondary shaping die. The secondary shaping mold of the spiral blade comprises an upper mold block, a lower mold block and a top piece block, the lower mold block is located below the upper mold block, the lower surface of the upper mold block is provided with an upper spiral blade forming surface, the upper surface of the lower mold block is provided with a first lower spiral blade forming surface, the top piece block is arranged in a receiving cavity of the lower mold block and can be driven to move up and down, the upper surface of the top piece block is provided with a second lower spiral blade forming surface, and the second lower spiral blade forming surface can be in abutment with the first lower spiral blade forming surface to form a lower spiral blade forming surface; wherein the upper spiral blade forming surface and the lower spiral blade forming surface are arranged oppositely.

10. A spiral vane forming assembly according to claim 9, wherein, The lower surface of the upper mold block is further provided with a first reverse side plate, the upper surface of the lower mold block is provided with a second reverse side plate, the first reverse side plate is provided with a first limiting surface, the second reverse side plate is provided with a second limiting surface, the first limiting surface faces away from one side of the starting end of the lower spiral blade forming surface, and when the upper mold block and the lower mold block are closed, the first limiting surface and the second limiting surface are in abutment and extrusion.

11. A screw flight forming mechanism, characterized by, The spiral blade forming mold comprises the spiral blade forming mold of any one of claims 1 to 8, a first machine tool ejector rod and a first driving mechanism, the first machine tool ejector rod passes through the lower mold base from bottom to top and is connected with the bottom of the top piece block, and the driving end of the first driving mechanism is connected with the upper mold base and drives the upper mold base to move up and down.

12. A screw flight forming mechanism, characterized by, The spiral blade forming assembly comprises the spiral blade forming mold of any one of claims 9 or 10, a first machine tool ejector rod, a first driving mechanism, a second machine tool ejector rod and a second driving mechanism, the first machine tool ejector rod passes through the lower mold base from bottom to top and is connected with the bottom of the top piece block, and the driving end of the first driving mechanism is connected with the upper mold base and drives the upper mold base to move up and down. The second machine tool ejector rod passes through the lower mold block from bottom to top and is connected with the bottom of the top piece block, and the driving end of the second driving mechanism is connected with the upper mold block and drives the upper mold block to move up and down.

13. A helical vane forming process characterized by, The spiral blade forming mechanism of claim 11 is adopted to realize the following steps: placing one end of the plate to be formed on a lower pressing plane, placing the middle part of the plate to be formed on the top piece block, driving the upper mold base to move downward by the driving mechanism, gradually approaching and contacting the upper pressing plane on the upper mold base and one end of the plate to be formed, contacting the top piece block by the first runner and extruding the top piece block to make the third lower pressing spiral surface abut with the first lower pressing spiral surface and the second lower pressing spiral surface respectively, gradually approaching and contacting the upper pressing spiral surface and the middle part and the other end of the plate to be formed, and extruding the middle part and the other end of the plate to be formed by the upper pressing spiral surface and the lower pressing spiral surface, thereby obtaining the plate to be shaped.

14. A spiral vane forming process, characterized by, The forming mechanism of the spiral blade is realized by the method of claim 12, and the method comprises the following steps: placing one end of the plate to be formed on a lower pressing plane, placing the middle part of the plate to be formed on a top piece, driving the upper die seat downward by a first driving mechanism, gradually approaching and contacting the upper pressing plane on the upper die seat to one end of the plate to be formed, contacting and extruding the top piece by the forerunner to make the third lower pressing helical surface abut against the first lower pressing helical surface and the second lower pressing helical surface respectively, gradually approaching and contacting the upper pressing helical surface to the middle part and the other end of the plate to be formed, and extruding the middle part and the other end of the plate to be formed by the upper pressing helical surface and the lower pressing helical surface, thereby obtaining the plate to be shaped partially formed; placing the formed part of the plate to be shaped partially formed on the second lower helical blade forming surface on the upper surface of the top piece block, driving the upper die block downward by a second driving mechanism, contacting and pressing the upper helical blade forming surface on the upper die block to the second lower helical blade forming surface, and driving the top piece block downward until the second lower helical blade forming surface abuts against the first lower helical blade forming surface, so that the unformed part of the plate to be shaped is extruded and formed between the first lower helical blade forming surface and the upper helical blade forming surface, and a formed spiral blade is obtained.

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