Die for effectively improving material flow of thin-wall stretching part

Abstract

The utility model discloses a die capable of effectively improving material flow of a thin-wall stretching part. The die comprises an upper die and a lower die, the upper die is provided with a first forming structure; the lower die is provided with a second forming structure which is used for guiding and positioning a semi-finished product; the second forming structure comprises an extrusion rod; the guide sleeve is sleeved on the extrusion rod and is in sliding connection with the extrusion rod; as the upper die moves towards the lower die, the first forming structure makes contact with a semi-finished product, and a gap is formed between the guide sleeve and the first forming structure; the upper die continues to move towards the lower die, one end of the extrusion rod protrudes out of the guide sleeve and enters the first forming structure, the extrusion rod and the first forming structure are stretched together to form a semi-finished product, in the stretching forming process, the guide sleeve moves downwards along the extrusion rod, and a gap is always kept between the guide sleeve and the first forming structure; therefore, the technical problems that the stretching precision is not uniform, the machining quality is relatively poor, and stretching cracks are prone to occurring are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle parts processing device technical field, specifically effective improvement thin -walled drawing piece material flow's mould. BACKGROUND

[0002] There are many kinds of vehicles, which are broadly divided into motor vehicles and non-motor vehicles. Automobiles are a kind of motor vehicles. In recent years, with the development of the automobile industry, people have increasingly high requirements for automobiles. One of the requirements is the lightweight of automobiles.

[0003] The lightweight of automobiles means that the overall mass of the automobile is reduced as much as possible under the premise of ensuring the strength and safety performance of the automobile, thereby improving the power performance of the automobile, reducing fuel consumption, and reducing exhaust pollution. Therefore, more and more parts on the automobile adopt the thin-walled scheme, and as many functions as possible are integrated on a part to reduce the number of parts and achieve the lightweight of the automobile.

[0004] For example, the protective shell on the high-pressure oil pump sensor uses a raw material with a thickness of 0.25 mm, which is a thin-walled drawing piece. In order to ensure concentricity, a guide sleeve is used to guide the previous process every time the drawing is performed. The concave die descends with the punch press, contacts the semi-finished product, continues to descend, and extrudes the material by the concave die, indirectly exits the guide sleeve from the product, and finally completes the drawing. For thin-walled parts, the friction increases during the extrusion of the guide sleeve by the concave die, and the stress of the semi-finished product increases, which can easily cause cracking. At the same time, the material is easily thinned during extrusion, which causes the end of one end to be stacked with material, resulting in a non-uniform height of the product. The processing quality is relatively poor, and the precision of the product is not uniform. When the product is installed in the vehicle, it can affect the response time of the sensor and thus affect the reaction of the control system to the vehicle, which poses a safety hazard. SUMMARY

[0005] In view of the above problems in the related art, the present application provides a mould for effectively improving the material flow of a thin-walled drawing piece, to solve the technical problems of non-uniform drawing precision, relatively poor processing quality, and easy cracking in the related art.

[0006] The technical solution to achieve the purpose is as follows: a mould for effectively improving the material flow of a thin-walled drawing piece, comprising: an upper die and a lower die.

[0007] The upper die has at least one first forming structure.

[0008] The lower die has at least one second forming structure, which is used to guide and position the semi-finished product.

[0009] The second forming structure comprises: an extrusion rod; and a guide sleeve, which is sleeved on the extrusion rod and is in sliding connection with the extrusion rod.

[0010] With the upper die moving position towards the lower die, the first forming structure contacts the semi-product, and the guide sleeve has a gap with the first forming structure;

[0011] The upper die continues to move position towards the lower die, one end of the extruding rod protrudes out of the guide sleeve and enters the first forming structure, and the extruding rod and the first forming structure stretch and form the semi-product together. During the stretching and forming, the guide sleeve moves position downwards along the extruding rod, and the gap between the guide sleeve and the first forming structure is always kept.

[0012] Further, the upper die further comprises: an upper die support, the upper die support has at least one first space and at least one second space, the first space is arranged apart from the second space, and the first space has the first forming structure;

[0013] At least one first elastic top rod is arranged at the first space, one end of the first elastic top rod is in sliding connection with the first forming structure, and the first elastic top rod is used for contacting the semi-product first when the upper die moves position towards the lower die;

[0014] At least one second elastic top rod is arranged at the second space, and the second elastic top rod is used for abutting against the guide sleeve when the upper die moves position towards the lower die, so as to form the gap between the guide sleeve and the first forming structure.

[0015] Further, the upper die support comprises: an upper die seat;

[0016] An upper base plate is arranged on the bottom surface of the upper die seat;

[0017] An upper die plate is arranged on the bottom surface of the upper base plate, the upper die plate is connected with the first forming structure, and the upper die plate and the upper die seat have the first space and the second space together.

[0018] Further, the lower die further comprises: a lower die support, the lower die support is provided with at least one third space, at least one fourth space, at least one fifth space and at least one sixth space, the guide sleeve is arranged at the third space, the extruding rod is arranged at the third space and the fourth space, and one end of the second elastic top rod is accommodated at the fifth space;

[0019] At least one third elastic top rod is arranged at the sixth space, the third elastic top rod supports and holds the guide sleeve from below, and the supporting elastic force of the third elastic top rod is smaller than the downward pressing elastic force of the second elastic top rod.

[0020] Further, the lower die support comprises: a lower die seat;

[0021] a lower die plate arranged on the top of the lower die seat, the lower die plate having the fourth space, and the lower die plate and the lower die seat having the sixth space;

[0022] and a stripper plate arranged on the top of the lower die plate and spaced apart from the lower die plate, the stripper plate having the third space and the fifth space, the stripper plate being connected to the guide sleeve and sliding along the extrusion rod together with the guide sleeve.

[0023] Further, the first forming structure has a cylindrical shape and has a forming cavity in the middle position, and the forming cavity has a first chamfer at one end.

[0024] Further, the extrusion rod is a circular rod and has a stepped shape.

[0025] Further, when the upper die and the lower die are not in contact and the semi-finished product is not stretched and formed, the top of the extrusion rod is higher than the top of the guide sleeve.

[0026] Further, the guide sleeve comprises a transverse block body connected to the extrusion rod in a sliding manner.

[0027] and a longitudinal sleeve body connected to the transverse block body and connected to the extrusion rod in a sliding manner.

[0028] Further, the top of the longitudinal sleeve body has a second chamfer, and the second chamfer and the first chamfer have the gap therebetween.

[0029] The above technical scheme has the following beneficial effects: a mold for effectively improving the material flow of a thin-walled stretched part, compared with related technologies, the mold is provided with an upper die and a lower die; the upper die has a first forming structure; the lower die has a second forming structure for guiding and positioning a semi-finished product; the second forming structure comprises an extrusion rod and a guide sleeve.

[0030] When the semi-finished product is formed, the upper die moves in the direction of the lower die, the first forming structure contacts the semi-finished product, at this time, the guide sleeve and the first forming structure have a gap therebetween.

[0031] The upper die continues to move in the direction of the lower die, one end of the extrusion rod protrudes out of the guide sleeve and enters the first forming structure, the extrusion rod and the first forming structure stretch and form the semi-finished product together, and in the process of stretching and forming, the guide sleeve moves downward along the extrusion rod, and the guide sleeve and the first forming structure always maintain a gap therebetween.

[0032] Since the guide sleeve and the first forming structure always maintain a gap therebetween, the semi-finished product is not excessively extruded, the probability of stretching cracking is reduced, the stretching precision is relatively uniform, and the processing quality is relatively good.

[0033] Therefore, the technical problems of inconsistent stretching precision, relatively poor processing quality and easy stretching cracking are solved, the technical effects of relatively uniform stretching precision, relatively good processing quality and reduced probability of stretching cracking are achieved, and the method has practicality. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is a total assembly view;

[0035] Figure 2 is Figure 1 is a structure diagram of the first forming structure contacting the semi-finished product when the upper die moves to the lower die direction;

[0036] Figure 3 is a structure diagram of the semi-finished product after being stretched and formed;

[0037] Figure 4 is a partial enlarged diagram of the first forming structure, the extrusion rod and the guide sleeve;

[0038] Figure 5 is a partial sectional view of the guide sleeve;

[0039] Figure 6 is a structure diagram of the protection shell after being stretched and formed on the high-pressure oil pump sensor;

[0040] In the figure: 10. upper die, 11. first forming structure, 11-1. forming inner cavity, 11-11. first chamfer, 12. upper die support, 12-1. first space, 12-2. second space, 121. upper die seat, 122. upper pad plate, 123. upper die plate, 13. first elastic ejector rod, 14. second elastic ejector rod, 20. lower die, 21. second forming structure, 21-1. extrusion rod, 21-2. guide sleeve, 21-21. transverse block, 21-22. longitudinal sleeve, 21-221. second chamfer, 22. lower die support, 22-1. third space, 22-2. fourth space, 22-3. fifth space, 22-4. sixth space, 221. lower die seat, 222. lower die plate, 223. stripper plate, 23. third elastic ejector rod, 30. gap, 100. semi-finished product, 1000. first stepped section, 2000. second stepped section, 3000. third stepped section, 4000. fourth stepped section. DETAILED DESCRIPTION

[0041] In order to make the content easier to be clearly understood, the following is further described in detail according to specific embodiments and in combination with the drawings;

[0042] The utility model provides a mould that effectively improves material flow of thin wall drawing piece solves the technical problem of not unified drawing precision, relatively poor processing quality and easy to appear drawing crack in the prior art, can be manufactured and used, reaches relatively unified drawing precision, relatively good processing quality, reduces the probability of appearing drawing crack, and the overall idea is as follows:

[0043] An embodiment is as follows:

[0044] As shown in Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 6 The utility model provides a mould that effectively improves material flow of thin wall drawing piece, comprising upper die 10 and lower die 20;

[0045] At least a first forming structure 11 is arranged on the upper die 10;

[0046] At least a second forming structure 21 is arranged on the lower die 20, and the second forming structure 21 is used for guiding and positioning the semi-finished product 100;

[0047] The second forming structure 21 comprises an extrusion rod 21-1 and a guiding sleeve 21-2 sleeved on the extrusion rod 21-1 and connected with the extrusion rod 21-1 in sliding mode;

[0048] When the upper die 10 moves to the lower die 20, the first forming structure 11 contacts the semi-finished product 100, and the guiding sleeve 21-2 and the first forming structure 11 have a gap 30 therebetween;

[0049] When the upper die 10 continues to move to the lower die 20, one end of the extrusion rod 21-1 protrudes from the guiding sleeve 21-2 and enters the first forming structure 11, the extrusion rod 21-1 and the first forming structure 11 are used to stretch and form the semi-finished product 100, and in the process of stretch forming, the guiding sleeve 21-2 moves downward along the extrusion rod 21-1, and the gap 30 is always kept between the guiding sleeve 21-2 and the first forming structure 11;

[0050] Specifically, when the semi-finished product 100 is formed, the semi-finished product 100 is arranged on the second forming structure 21 and guided and positioned by the second forming structure 21, the upper die 10 moves to the lower die 20, the first forming structure 11 contacts the semi-finished product 100, and the gap 30 is kept between the guiding sleeve 21-2 and the first forming structure 11;

[0051] The upper die 10 continues to move to the lower die 20 direction, extruding the one end of the extruding rod 21-1 to protrude the guide sleeve 21-2 into the first forming structure 11, and the extruding rod 21-1 is stretched and formed with the first forming structure 11 to form the semi-finished product 100, and in the process of stretching and forming, the guide sleeve 21-2 moves downward along the extruding rod 21-1, and the gap 30 is always kept between the guide sleeve 21-2 and the first forming structure 11;

[0052] Because the gap 30 is always kept between the guide sleeve 21-2 and the first forming structure 11, the semi-finished product 100 is not excessively extruded, the probability of stretching cracking is reduced, the stretching precision is relatively uniform, and the processing quality is relatively good;

[0053] The "flow" in the subject name is different from the flow of liquid, which means that the metal thin-walled material appears stretching and extension when being extruded and stretched, and a similar flow condition is generated, for example: Figure 6 The protective shell on the high-pressure oil pump sensor in the high-pressure oil pump sensor is extruded and stretched when a cylindrical semi-finished product 100 is used, the semi-finished product 100 is sleeved on the second forming structure 21, and the semi-finished product 100 is stretched and extended to form a four-step hollow shell structure when the first forming structure 11 and the second forming structure 21 are extruded and stretched;

[0054] Another embodiment:

[0055] As shown in Figure 1 , Figure 2 , Figure 3 , Figure 4 ; in implementation, the upper die 10 further comprises: an upper die support 12, at least one first space 12-1 and at least one second space 12-2 are formed on the upper die support 12, the first space 12-1 and the second space 12-2 are arranged at intervals, and the first forming structure 11 is arranged in the first space 12-1; at least one first elastic ejector rod 13 is arranged at the first space 12-1, one end of the first elastic ejector rod 13 is slidably connected with the first forming structure 11, and the first elastic ejector rod 13 is used to first contact the semi-finished product 100 when the upper die 10 moves to the lower die 20 direction; and at least one second elastic ejector rod 14 is arranged at the second space 12-2, and the second elastic ejector rod 14 is used to abut against the guide sleeve 21-2 when the upper die 10 moves to the lower die 20 direction, so as to form the gap 30 between the guide sleeve 21-2 and the first forming structure 11;

[0056] The first forming structure 11 is in a cylindrical structure, and a forming inner cavity 11-1 is arranged at a middle position of the first forming structure 11, and the forming inner cavity 11-1 is provided with a first chamfer 11-11 at one end;

[0057] The first chamfer 11-11 is an arc chamfer, which is beneficial to guide the extruding rod 21-1 and will not damage the semi-finished product 100.

[0058] The first forming structure 11 is tightly fitted in the first space 12-1; the forming inner cavity 11-1 is arranged according to the shape of the product to be processed, such as: Figure 6 The protective shell on the high-pressure oil pump sensor in the high-pressure oil pump sensor is formed into a four-step hollow shell structure after extrusion stretching forming, and the forming inner cavity 11-1 is also a four-step structure;

[0059] The four-step hollow shell structure includes: a first step section 1000; a second step section 2000 connected to one end of the first step section 1000; a third step section 3000 connected to the other end of the second step section 2000; and a fourth step section 4000 connected to the third step section 3000; the outer diameter size of the first step section 1000 is smaller than the outer diameter size of the second step section 2000, smaller than the outer diameter size of the third step section 3000, and smaller than the outer diameter size of the fourth step section 4000;

[0060] The upper die support 12 includes: an upper die seat 121; an upper pad plate 122 arranged on the bottom surface of the upper die seat 121; and an upper die plate 123 arranged on the bottom surface of the upper pad plate 122, connected to the first forming structure 11, and having the first space 12-1 and the second space 12-2 together with the upper pad plate 122 and the upper die seat 121;

[0061] The upper die seat 121 is a block structure, such as a square block, which has a regular shape, is convenient for processing and manufacturing, and is also conducive to connection with the main shaft of the punch; the upper pad plate 122 is a plate structure, such as a square plate, which has a regular shape, is convenient for processing and manufacturing, and is also conducive to connection with the upper die seat 121; the upper die plate 123 is a plate structure, such as a square plate, which has a regular shape, is convenient for processing and manufacturing, and is also conducive to connection with the upper pad plate 122 and the upper die seat 121;

[0062] The first space 12-1 is provided, which is conducive to assembly of the first forming structure 11 and the first elastic ejector pin 13, and the relative assembly is convenient and the structural reliability is relatively good;

[0063] The second space 12-2 is provided, which is conducive to assembly of the second elastic ejector pin 14, and the relative assembly is convenient and the structural reliability is relatively good;

[0064] The first elastic ejector pin 13 includes: a first ejector pin; and a first spring; the first ejector pin has a "T" shaped structure, which is used to contact the semi-finished product 100, and is conducive to positioning of the semi-finished product 100 on the second forming structure 21; the first spring is a cylindrical spring, which has an elastic supporting and buffering effect, and is conducive to gradual forming of the semi-finished product 100 by the first forming structure 11 and the second forming structure 21;

[0065] In the process of forming the semi-finished product 100, the first ejector rod moves upward along the first space 12-1 and the first forming structure 11, and the first spring is compressed; after the semi-finished product 100 is formed, the upper die 10 moves upward with the action of the machine tool, and the upper die 10 is separated from the lower die 20, the first spring returns to the original position, and the first ejector rod returns to the original position in linkage;

[0066] The second elastic ejector rod 14 comprises: a second ejector rod; and a second spring; the second ejector rod has a substantially "T" shaped structure, and is used for contacting the guide sleeve 21-2; the second spring is a cylindrical spring, and has the function of elastic support and buffering; the guide sleeve 21-2 is pressed downward by the second elastic ejector rod 14, so that the gap 30 is formed between the guide sleeve 21-2 and the first forming structure 11, and the gap 30 is always kept between the guide sleeve 21-2 and the first forming structure 11 in the process of forming the semi-finished product 100, so that the semi-finished product 100 is not excessively extruded, the probability of tensile cracking is reduced, the tensile precision is relatively uniform, and the processing quality is relatively good;

[0067] Another embodiment:

[0068] As shown in Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 indicated; in implementation, the lower die 20 further comprises: a lower die support 22, at least one third space 22-1, at least one fourth space 22-2, at least one fifth space 22-3 and at least one sixth space 22-4 are arranged on the lower die support 22, the guide sleeve 21-2 is arranged at the third space 22-1, the extrusion rod 21-1 is arranged at the third space 22-1 and the fourth space 22-2, and one end of the second elastic ejector rod 14 is accommodated at the fifth space 22-3; and at least one third elastic ejector rod 23 is arranged at the sixth space 22-4, supports and holds the guide sleeve 21-2 from bottom to top, and the supporting elastic force of the third elastic ejector rod 23 is smaller than the downward pressing elastic force of the second elastic ejector rod 14;

[0069] The extrusion rod 21-1 is a section of circular rod, has a stepped structure, and is matched with the shape of the forming inner cavity 11-1, and is used for stretching the semi-finished product 100 together with the first forming structure 11;

[0070] The guide sleeve 21-2 comprises: a transverse block body 21-21, which is in sliding connection with the extrusion rod 21-1; and a longitudinal sleeve body 21-22, which is connected to the transverse block body 21-21 and is in sliding connection with the extrusion rod 21-1; one end of the transverse block body 21-21 is used for abutting against the second elastic ejector rod 14; and the longitudinal sleeve body 21-22 is tightly fitted at the third space 22-1, so that the guide sleeve 21-2 and the stripper plate 223 form a relatively integral whole.

[0071] The top of the longitudinal sleeve body 21-22 has a second chamfer 21-221, and the second chamfer 21-221 has the gap 30 with the first chamfer 11-11; the second chamfer 21-221 is an arc chamfer, which can guide the semi-finished product 100 and will not damage the semi-finished product 100;

[0072] The lower die support 22 comprises a lower die seat 221, a lower die plate 222 arranged on the top of the lower die seat 221, the lower die plate 222 having the fourth space 22-2 and the lower die plate 222 and the lower die seat 221 having the sixth space 22-4, and an ejection plate 223 arranged on the top of the lower die plate 222 and spaced apart from the lower die plate 222, the ejection plate 223 having the third space 22-1 and the fifth space 22-3, and the ejection plate 223 being connected to the guide sleeve 21-2 and sliding together with the guide sleeve 21-2 along the extrusion rod 21-1;

[0073] The lower die seat 221 is a block structure, such as a square block, which has a regular shape and is convenient for processing and manufacturing and is also conducive to connection with the punch bed; the lower die plate 222 is a plate structure, such as a square plate, which has a regular shape and is convenient for processing and manufacturing and is also conducive to connection with the lower die seat 221; and the ejection plate 223 is a plate structure, such as a square plate, which has a regular shape and is convenient for processing and manufacturing;

[0074] The third elastic top rod 23 comprises a third top rod and a third spring; the third top rod has a "T" shape structure and is used for supporting the guide sleeve 21-2; and the third spring is a cylindrical spring and has an elastic supporting and buffering effect;

[0075] The supporting elastic force of the third spring is smaller than the downward pressing elastic force of the second spring, so that the gap 30 is formed and the gap 30 can be maintained all the time as the upper die 10 moves to the lower die 20 (the gap 30 is not a fixed value and needs to be selected according to the product to be formed, such as 0.25 mm);

[0076] The third elastic top rod 23 not only can elastically support the guide sleeve 21-2 and the ejection plate 223, but also can be reset gradually as the upper die 10 moves upward after the semi-finished product 100 is stretched and formed, the upper die 10 and the lower die 20 are gradually separated, the third elastic top rod 23 is gradually reset, the third elastic top rod 23 links the guide sleeve 21-2 and the ejection plate 223 upward, and the semi-finished product 100 after forming is pushed down from the extrusion rod 21-1, so that the ejection is realized and the operation is relatively convenient;

[0077] Another embodiment:

[0078] like Figure 1 As shown; during implementation, when the upper mold 10 and the lower mold 20 are not in contact and the semi-finished product 100 is not stretched and formed, the top of the extrusion rod 21-1 is higher than the top of the guide sleeve 21-2. This allows the first forming structure 11 to support the guide sleeve 21-2 when it first starts extruding the semi-finished product 100, because the top of the extrusion rod 21-1 is higher than the top of the guide sleeve 21-2. The second chamfer 21-221 on the guide sleeve 21-2 will not be deformed by extrusion, and it will not affect the smooth sliding position of the guide sleeve 21-2 along the extrusion rod 21-1. The structure has relatively good reliability and ensures the processing quality.

[0079] The working principle is as follows: When forming the semi-finished product 100, the semi-finished product 100 is placed on the second forming structure 21 and guided and positioned by the second forming structure 21. The upper mold 10 moves to the lower mold 20. The first forming structure 11 and the first elastic push rod 13 contact the semi-finished product 100. The second elastic push rod 14 presses down on the guide sleeve 21-2. The third elastic push rod 23 elastically supports the guide sleeve 21-2 from bottom to top. There is a gap 30 between the guide sleeve 21-2 and the first forming structure 11.

[0080] The upper mold 10 continues to move towards the lower mold 20. One end of the extrusion rod 21-1 protrudes from the guide sleeve 21-2 and enters the first forming structure 11. The extrusion rod 21-1 and the first forming structure 11 are stretched together to form the semi-finished product 100. During the stretching process, the guide sleeve 21-2 moves downward along the extrusion rod 21-1. The guide sleeve 21-2 and the first forming structure 11 always maintain a gap of 30. After the semi-finished product 100 is formed, the upper mold 10 moves upward and gradually separates from the lower mold 20. The third elastic push rod 23 also gradually returns to its original position. The third elastic push rod 23 moves upward in conjunction with the guide sleeve 21-2 and the unloading plate 223. It slides along the extrusion rod 21-1 and pushes the formed semi-finished product 100 down from the extrusion rod 21-1.

[0081] In the description, it should be understood that the terms "up", "down", "left", "right", "front", "back", "lateral", "longitudinal", etc., indicate the orientation or positional relationship based on the positional relationship shown in the accompanying drawings, and are only for the convenience or simplification of the description, rather than indicating a specific orientation that must be present; the operation process described in the embodiments is not an absolute usage step, and corresponding adjustments can be made in actual use;

[0082] Unless otherwise defined, technical terms or scientific terms used herein shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terms "first", "second", and similar terms do not imply any order, quantity, or importance, but are used to distinguish different components, and the terms "one", "another", and similar terms do not determine the quantity, but mean at least one, according to the content of the embodiments;

[0083] The above description is only the preferred specific implementation, but the protection scope is not limited to this, any person skilled in the art in the disclosed technical range, according to the technical solution and the inventive concept, equivalent replacement or change, should be covered in the protection scope of the application.

Claims

1. A mold effective to improve material flow in thin wall stretch parts, characterized by, The utility model relates to a kind of stretch forming die, including: Upper die (10) and lower die (20); At least a first forming structure (11) is provided on the upper die (10); At least a second forming structure (21) is provided on the lower die (20), and the second forming structure (21) is used to guide and position semi-finished product (100); The second forming structure (21) includes: extrusion rod (21-1) and guide sleeve (21-2), which is sleeved on the extrusion rod (21-1) and is in sliding connection with the extrusion rod (21-1); As the upper die (10) moves to the lower die (20), the first forming structure (11) contacts the semi-finished product (100), and the guide sleeve (21-2) has a gap (30) with the first forming structure (11); The upper die (10) continues to move to the lower die (20), one end of the extrusion rod (21-1) protrudes from the guide sleeve (21-2) and enters the first forming structure (11), the extrusion rod (21-1) and the first forming structure (11) stretch form the semi-finished product (100) together, and in the process of stretch forming, the guide sleeve (21-2) moves downward along the extrusion rod (21-1), and the gap (30) between the guide sleeve (21-2) and the first forming structure (11) is always maintained.

2. A mold for effectively improving material flow of a thin-walled stretch part according to claim 1, wherein: The upper die (10) further includes: upper die support (12), which has at least a first space (12-1) and at least a second space (12-2), and the first space (12-1) is spaced apart from the second space (12-2), and the first forming structure (11) is in the first space (12-1); At least a first elastic ejector rod (13) is arranged at the first space (12-1) and in sliding connection with the first forming structure (11) at one end, for contacting the semi-finished product (100) first when the upper die (10) moves to the lower die (20); And at least a second elastic ejector rod (14) is arranged at the second space (12-2), for abutting against the guide sleeve (21-2) when the upper die (10) moves to the lower die (20), to form the gap (30) between the guide sleeve (21-2) and the first forming structure (11).

3. A mold for effectively improving material flow of a thin-walled stretch part according to claim 2, wherein: The upper die support (12) includes: upper die seat (121); Upper backing plate (122) is arranged on the bottom surface of the upper die seat (121); And upper die plate (123) is arranged on the bottom surface of the upper backing plate (122), connected with the first forming structure (11), and has the first space (12-1) and the second space (12-2) with the upper backing plate (122) and the upper die seat (121).

4. A mold for effectively improving material flow of a thin-walled stretch part according to claim 2, wherein: The lower die (20) further comprises a lower die support (22) provided with at least a third space (22-1), at least a fourth space (22-2), at least a fifth space (22-3) and at least a sixth space (22-4), the guide sleeve (21-2) is arranged at the third space (22-1), the extrusion rod (21-1) is arranged at the third space (22-1) and the fourth space (22-2), and the fifth space (22-3) contains one end of the second elastic ejector rod (14); and at least a third elastic ejector rod (23) arranged at the sixth space (22-4) supports the guide sleeve (21-2) from bottom to top, and the supporting elastic force of the third elastic ejector rod (23) is smaller than the pressing elastic force of the second elastic ejector rod (14).

5. A mold for effectively improving material flow of a thin-walled stretch part according to claim 4, wherein: The lower die support (22) comprises a lower die base (221); a lower die plate (222) arranged on the top of the lower die base (221), the lower die plate (222) is provided with the fourth space (22-2), and the lower die plate (222) and the lower die base (221) are provided with the sixth space (22-4); and a stripper plate (223) arranged on the top of the lower die plate (222) and spaced apart from the lower die plate (222), the stripper plate (223) is provided with the third space (22-1) and the fifth space (22-3), and the stripper plate (223) is connected with the guide sleeve (21-2) and slides along the extrusion rod (21-1) together with the guide sleeve (21-2).

6. A mold for effectively improving material flow of a thin-walled stretch part according to claim 1, wherein: The first forming structure (11) has a cylindrical shape, and a forming inner cavity (11-1) is arranged in the middle position, and one end of the forming inner cavity (11-1) is provided with a first chamfer (11-11).

7. A mold for effectively improving material flow of a thin-walled stretch part according to claim 6, wherein: The extrusion rod (21-1) is a section of a circular rod and has a stepped structure.

8. A mold for effectively improving material flow of a thin-walled stretch part according to claim 7, wherein: When the upper die (10) and the lower die (20) are not in contact and the semi-finished product (100) is not stretched and formed, the top of the extrusion rod (21-1) is higher than the top of the guide sleeve (21-2).

9. A mold for effectively improving material flow of a thin-walled stretch part according to claim 6 or 8, wherein: The guide sleeve (21-2) comprises a transverse block (21-21) slidably connected with the extrusion rod (21-1); and a longitudinal sleeve (21-22) connected with the transverse block (21-21) and slidably connected with the extrusion rod (21-1).

10. A mold for effectively improving material flow of a thin-walled stretch part according to claim 9, wherein: The top of the longitudinal sleeve (21-22) is provided with a second chamfer (21-221), and the second chamfer (21-221) and the first chamfer (11-11) have the gap (30) therebetween.

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