Pushing assembly suitable for stainless steel elbow cold pushing forming process
By designing a push component for the cold push forming process of stainless steel elbows, the problems of uneven cross-section and uneven wall thickness after elbow forming in the prior art are solved, and a more uniform stress and a more efficient forming process are achieved.
Patent Information
- Application Number
- CN202421638967.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-11
- Publication Date
- 2025-06-20
- Estimated Expiration
- 2034-07-11
AI Technical Summary
In the existing cold push stainless steel elbow process, since the push rod is a cylinder, the push route is straight-line push, resulting in the cross-section of the elbow after forming and the wall thickness is uneven.
A pushing assembly is designed, including a large hydraulic cylinder, a push rod and a small hydraulic cylinder. The push rod is divided into the front half and the rear half in the axial direction. The rear half is equipped with grooves to accommodate the small hydraulic cylinder. The front half includes a fixing part and a tongue part. The cross-section of the tongue part and the fixing part is semicircular, and the tongue part is used to push and mold the inner diameter part of the elbow.
Through this design, the elbow is pushed twice to the inner diameter part, and the stress is more uniform. After the elbow is formed, the cross-section is rounder and the wall thickness is more uniform, which reduces the material cost and subsequent shaping and grinding processes, and improves the forming efficiency.
Smart Images
Figure CN222999444U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of stainless steel elbow preparation devices, and particularly relates to a pushing component suitable for the cold pushing forming process of stainless steel elbows. Background Art
[0002] In a pipeline system, a stainless steel elbow is a pipe fitting for changing the direction of the pipeline. The main forming method of a stainless steel elbow is the push-bending method, which can be divided into two types: cold push bending and mandrel hot push bending. The push-bending device for cold push bending has a simple structure, does not require special equipment, and has high productivity, so this method is more commonly used.
[0003] The cold push device mainly includes an upper die, a lower die, a push rod, and a mandrel. The upper die and the lower die are respectively provided with an upper die cavity and a lower die cavity. The mandrel is placed at a position close to one end of the lower die cavity, while the push rod is close to the other end of the lower die cavity. When a tube blank needs to be cold pushed, the tube blank is placed between the mandrel and the push rod. One end of the tube blank abuts against one end of the mandrel. The upper die descends and combines with the lower die. The push rod directly pushes the tube blank with the aid of a hydraulic cylinder, pushing the tube blank towards the mandrel. Since the diameter of the push rod gradually becomes larger from the front end to the rear end, the inner diameter of the tube blank is the same as the diameter of the front end of the push rod. The front end of the push rod can extend into the tube blank. During the forward movement of the push rod, the tube blank is also sleeved onto the mandrel to form, and at the same time, the tube blank is expanded in diameter.
[0004] However, existing push rods are all cylindrical, and the pushing route is a straight push, resulting in relatively weak force on the inner diameter edge of the elbow and relatively strong force on the outer diameter edge of the elbow. This causes the cross-section of the elbow after forming to be non-round and the wall thickness to be uneven. Therefore, the wall thickness of the tube blank must be made larger than the target wall thickness value, and only after the elbow is formed can the expected wall thickness value be achieved, resulting in a relatively high material cost. Moreover, due to the non-roundness and uneven wall thickness of the elbow after forming, the elbow needs to go through two additional processes after forming: shaping to be round and wall thickness grinding, which increases the cost and the production efficiency of the elbow is also relatively low. Summary of the Utility Model
[0005] Therefore, the technical problem to be solved by the present utility model is to overcome the problems in the current cold push stainless steel elbow process, where due to the push rod being cylindrical and the pushing route being a straight push, it is easy to cause the cross-section of the elbow after forming to be non-round and the wall thickness to be uneven.
[0006] In order to solve the above technical problems, the utility model provides a pushing component suitable for the cold push forming process of stainless steel elbows, including a large hydraulic cylinder, a push rod and a small hydraulic cylinder, one end of the push rod is fixed on the telescopic rod of the large hydraulic cylinder, and the push rod and the telescopic rod of the large hydraulic cylinder are in a coaxial position relationship, and the push rod is divided into a front half and a rear half in the axial direction; the rear half is close to the large hydraulic cylinder, and the front half is close to the mold, and a groove is provided on the circumferential surface of the rear half, and the small hydraulic cylinder is accommodated in the groove and fixed to the rear half; the front half includes a fixed portion and a tongue, and the cross-sections of the tongue and the fixed portion are both semicircular, the diameter of the tongue head is slightly smaller than the diameter of the fixed portion, the center of the tongue coincides with the center of the fixed portion, the tongue is detached from the rear half, and the free end of the telescopic rod of the small hydraulic cylinder is fixed to the rear end of the tongue.
[0007] Preferably, the straight surface of the tongue portion is provided with a guide block extending along the axial direction of the tongue portion, and the straight surface of the fixing portion is provided with a guide groove extending along the axial direction of the fixing portion, and the guide block is located in the guide groove, and the guide block fits with the guide groove.
[0008] Preferably, a connecting ear is provided at one end of the small hydraulic cylinder facing away from the telescopic rod, and a first fixing hole is provided on the circumferential surface of the rear half located on the upper wall or the lower wall of the groove, and the first fixing hole and the connecting ear are penetrated by the same bolt I, and a nut is threadedly connected to the tail end of the bolt I, and the first fixing hole and the connecting ear are tightly pressed between the head of the bolt I and the nut.
[0009] Preferably, an insertion groove is provided on the rear end face of the tongue, a second fixing hole is provided on the upper wall of the insertion groove, a threaded hole is provided on the lower wall of the insertion groove, a connecting hole is provided at the free end of the telescopic rod of the small hydraulic cylinder, the free end of the telescopic rod of the small hydraulic cylinder is inserted into the insertion groove, a common bolt II is passed through the second fixing hole, the connecting hole and the threaded hole, a thread is provided at the tail of the bolt II, the tail of the bolt II is inserted into the threaded hole and is threadedly connected to the threaded hole, the head of the bolt II is located outside the fixing hole, and its diameter is larger than the diameter of the fixing hole.
[0010] Preferably, the cross-sections of the guide groove and the guide block are both stepped shapes, the guide groove includes a small diameter section I and a large diameter section I, the guide block includes a small diameter section II and a large diameter section II, the two upper and lower walls of the small diameter section I respectively abut against the upper and lower surfaces of the small diameter section II, the four wall surfaces of the large diameter section I respectively abut against the four wall surfaces of the large diameter section II, and the small diameter section I is close to the flat surface of the fixed part relative to the large diameter section I.
[0011] The technical solution of the utility model has the following beneficial effects:
[0012] After using the utility model to push and form the elbow, the tongue first forms the part of the elbow near the inner diameter, then pushes the entire push rod, and uses the fixing part to form the part of the elbow near the outer diameter. At this time, the tongue forms the part of the elbow near the inner diameter again. In this way, the part of the elbow near the inner diameter is pushed twice, and the force received is increased. While the part of the elbow near the outer diameter is pushed once, making the tube blank receive uniform force, the cross-section is more round, and the wall thickness is more uniform. When using the cold-pushed elbow of the utility model, the wall thickness of the tube blank does not need to be too large, saving material costs, and also saving two subsequent processes of shaping and rounding the elbow and grinding the wall thickness. This not only saves labor costs but also improves the efficiency of elbow forming. Description of the Drawings
[0013] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0014] Description of the reference numerals in the drawings: 1. Large hydraulic cylinder; 2. Push rod; 21. Front half section; 211. Fixing part; 212. Tongue; 212a. Insertion groove; 212b. Second fixing hole; 212c. Threaded hole; 22. Rear half section; 221. Groove; 222. First fixing hole; 3. Small hydraulic cylinder; 31. Connection hole; 4. Guide block; 41. Small diameter section II; 42. Large diameter section II; 5. Guide groove; 51. Small diameter section I; 52. Large diameter section I; 6. Connection ear; 7. Upper mold; 8. Lower mold.
[0015] Figure 1 Schematic diagram of the pushing component installed on the elbow forming machine;
[0016] Figure 2 Overall schematic diagram of the push rod from the first perspective;
[0017] Figure 3 Overall schematic diagram of the push rod from the second perspective;
[0018] Figure 4 Axial three-dimensional sectional view of the push rod;
[0019] Figure 5 Three-dimensional schematic diagram of the tongue;
[0020] Figure 6 Three-dimensional schematic diagram of the small hydraulic cylinder. Detailed implementation manners
[0021] The technical solution of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.
[0022] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.
[0023] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.
[0024] In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.
[0025] The present utility model provides a pushing component applicable to the cold pushing forming process of stainless steel elbows, including a large hydraulic cylinder 1, a pushing rod 2, and a small hydraulic cylinder 3. One end of the pushing rod 2 is fixed on the telescopic rod of the large hydraulic cylinder 1, and the pushing rod 2 and the telescopic rod of the large hydraulic cylinder 1 are in a coaxial positional relationship. The pushing rod 2 is divided into a front half section 21 and a rear half section 22 in the axial direction; the rear half section 22 is close to the large hydraulic cylinder 1, and the front half section 21 is close to the mold. A groove 221 is provided on the circumferential surface of the rear half section 22, and the small hydraulic cylinder 3 is accommodated in the groove 221 and fixed to the rear half section 22; the front half section 21 includes a fixing part 211 and a tongue part 212. The cross-sections of the tongue part 212 and the fixing part 211 are both semi-circular. The diameter of the head of the tongue part 212 is slightly smaller than the diameter of the fixing part 211, and the diameter of the head of the tongue part 212 is the same as the inner diameter of the tube blank. The centers of the tongue part 212 and the fixing part 211 coincide, the tongue part 212 is separated from the rear half section 22, and the free end of the telescopic rod of the small hydraulic cylinder 3 is fixed to the rear end of the tongue part 212.
[0026] Usage method of the utility model: In the initial state, the front end of the fixing part 211 protrudes outwards compared with the front end of the tongue part 212. Before pushing with the pushing rod 2, the mandrel has been positioned at the front part of the forming cavity of the lower die, and the tube blank (elbow raw material) has been positioned at the middle part of the forming cavity of the lower die, while the free end of the pushing rod 2 is positioned at the rear part of the forming cavity of the lower die, so that the tube blank is located between the mandrel and the pushing rod 2. The upper die descends and mates with the lower die. The diameter of the tube blank is equal to the diameter of the head of the tongue part 212, and the diameter of the fixing part 211 is larger than the diameter of the tube blank. When an elbow needs to be pushed, the large hydraulic cylinder 1 is started, and its telescopic rod extends, driving the whole pushing rod 2 to move towards the tube blank. When the front end of the fixing part 211 approaches the rear end of the tube blank, since the diameter of the fixing part 211 is larger than the diameter of the tube blank, the fixing part 211 cannot extend into the tube blank. The large hydraulic cylinder 1 stops working, causing the whole pushing rod 2 to stop moving forward; then the small hydraulic cylinder 3 is started, and the telescopic rod of the small hydraulic cylinder extends, driving the tongue part 212 to move forward relative to the fixing part 211. During the forward movement of the tongue part 212, it extends into the tube blank, and the tongue part 212 plays a role in pushing and forming the part of the tube blank near the inner diameter edge. Then the small hydraulic cylinder 3 stops working, and the tongue part 212 stops moving forward. The large hydraulic cylinder 1 is started again, pushing the whole pushing rod 2 forward. The fixing part 211 abuts against the rear end of the tube blank, pushing and forming the part of the tube blank near the outer diameter edge. At the same time, the tongue part 212 also pushes and forms the part of the elbow near the inner diameter again, finally pushing the tube blank into an elbow with a relatively round cross-section and uniform wall thickness.
[0027] When the whole pushing rod 2 moves forward, and the front end of the tongue part 212 abuts against the rear end of the mandrel, due to the reverse thrust of the mandrel, the tongue part 212 retracts backward to the initial state for the next use.
[0028] Previously, during the pushing process of the elbow, the part near the inner diameter was less stressed, while the part near the outer diameter was more stressed, resulting in a non-round cross-section and uneven wall thickness of the formed elbow, and two subsequent processes were required: shaping and rounding and wall thickness grinding. After using the utility model to push the elbow, the tongue part 212 first forms the part of the elbow near the inner diameter, and then pushes the whole pushing rod 2 forward, so that the fixing part 211 forms the part of the elbow near the outer diameter. At this time, the tongue part 212 also forms the part of the elbow near the inner diameter again. In this way, the part of the elbow near the inner diameter is pushed twice, increasing the force, while the part of the elbow near the outer diameter is pushed once. This makes the tube blank stressed evenly, with a relatively round cross-section and uniform wall thickness.
[0029] In order to ensure that the tongue 212 will not be skewed during the movement and avoid adverse effects on product quality, a guide block 4 extending along the axial direction of the tongue 212 is provided on the straight surface of the tongue 212, and a guide groove 5 extending along the axial direction of the fixed portion 211 is provided on the straight surface of the fixed portion 211. The guide block 4 is located in the guide groove 5, and the guide block 4 is matched with the guide groove 5. During the movement, the guide block 4 is always located in the guide groove 5, so that the tongue 212 always moves along the axial direction of the push rod 2.
[0030] The specific way in which the small hydraulic cylinder 3 is fixed to the fixing part 211 is as follows: a connecting ear 6 is provided at one end of the small hydraulic cylinder 3 away from the telescopic rod, a first fixing hole 222 is provided on the circumferential surface of the rear half 22 located on the upper wall or the lower wall of the groove 221, the first fixing hole 222 and the connecting ear 6 are penetrated by the same bolt I, a nut is threadedly connected to the tail end of the bolt I, and the first fixing hole 222 and the connecting ear 6 are tightly pressed between the head of the bolt I and the nut.
[0031] The specific method of the telescopic rod of the small hydraulic cylinder 3 and the tongue 212 is as follows: the rear end face of the tongue 212 is provided with an insertion groove 212a, the upper wall of the insertion groove 212a is provided with a second fixing hole 212b, and the lower wall of the insertion groove 212a is provided with a threaded hole 212c. The free end of the telescopic rod of the small hydraulic cylinder 3 is provided with a connecting hole 31, and the free end of the telescopic rod of the small hydraulic cylinder 3 extends into the insertion groove 212a. The second fixing hole 212b, the connecting hole 31 and the threaded hole 212c are penetrated by a common bolt II, and the tail of the bolt II is provided with a thread, and the tail of the bolt II is inserted into the threaded hole 212c and is threadedly connected with the threaded hole 212c. The head of the bolt II is located outside the fixing hole, and its diameter is larger than the diameter of the fixing hole.
[0032] In order to further improve the stability of the movement of the tongue 212, the cross-sections of the guide groove 5 and the guide block 4 are both stepped. The guide groove 5 includes a small diameter section I51 and a large diameter section I52, and the guide block 4 includes a small diameter section II41 and a large diameter section II42. The two upper and lower walls of the small diameter section I51 are respectively against the upper and lower surfaces of the small diameter II, and the four wall surfaces of the large diameter section I52 are respectively against the four wall surfaces of the large diameter section II42. The small diameter section I51 is closer to the flat surface of the fixed portion 211 relative to the large diameter section I52, so that the large diameter section II42 is limited left and right by the large diameter section I52, preventing the guide block 4 from moving left and right.
[0033] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.
Claims
1. A push-forming assembly suitable for a cold push-forming process for a stainless steel elbow, comprising a large hydraulic cylinder (1) and a push rod (2), one end of the push rod (2) being fixed to a telescopic rod of the large hydraulic cylinder (1), and the push rod (2) and the telescopic rod of the large hydraulic cylinder (1) being in a coaxial position relationship, characterized in that: It also includes a small hydraulic cylinder (3), wherein the push rod (2) is divided into a front half section (21) and a rear half section (22) in the axial direction; the rear half section (22) is close to the large hydraulic cylinder (1), and the front half section (21) is close to the mold; a groove (221) is provided on the circumferential surface of the rear half section (22); the small hydraulic cylinder (3) is accommodated in the groove (221) and is fixed to the rear half section (22); the front half section (21) includes a fixing portion (211) and a tongue portion (212); the cross sections of the tongue portion (212) and the fixing portion (211) are both semicircular; the diameter of the head of the tongue portion (212) is slightly smaller than the diameter of the fixing portion (211); the center of the tongue portion (212) coincides with the center of the fixing portion (211); the tongue portion (212) is separated from the rear half section (22); and the free end of the telescopic rod of the small hydraulic cylinder (3) is fixed to the rear end of the tongue portion (212).
2. A push-forming assembly suitable for the cold push-forming process of stainless steel elbows according to claim 1, characterized in that: The straight surface of the tongue portion (212) is provided with a guide block (4) extending axially along the tongue portion (212), the straight surface of the fixing portion (211) is provided with a guide groove (5) extending axially along the fixing portion (211), the guide block (4) is located in the guide groove (5), and the guide block (4) fits with the guide groove (5).
3. The push-forming assembly suitable for the cold push-forming process of stainless steel elbows according to claim 1 is characterized in that: The small hydraulic cylinder (3) is provided with a connecting ear (6) at one end away from the telescopic rod, and a first fixing hole (222) is provided on the circumferential surface of the rear half (22) located on the upper wall or the lower wall of the groove (221), and the first fixing hole (222) and the connecting ear (6) are inserted into the same bolt I, and a nut is threadedly connected to the tail of the bolt I, and the first fixing hole (222) and the connecting ear (6) are tightly pressed between the head of the bolt I and the nut.
4. A push-forming assembly suitable for the cold push-forming process of stainless steel elbows according to claim 1, characterized in that: The rear end surface of the tongue portion (212) is provided with an insertion groove (212a), the upper wall of the insertion groove (212a) is provided with a second fixing hole (212b), the lower wall of the insertion groove (212a) is provided with a threaded hole (212c), the free end of the telescopic rod of the small hydraulic cylinder (3) is provided with a connecting hole (31), the free end of the telescopic rod of the small hydraulic cylinder (3) is inserted into the insertion groove (212a), the second fixing hole (212b), the connecting hole (31) and the threaded hole (212c) are penetrated by a common bolt II, the tail of the bolt II is provided with threads, the tail of the bolt II is inserted into the threaded hole (212c) and is threadedly connected to the threaded hole (212c), the head of the bolt II is located outside the fixing hole, and its diameter is larger than the diameter of the fixing hole.
5. The push-forming assembly suitable for the cold push-forming process of stainless steel elbows according to claim 2 is characterized in that: The cross-sections of the guide groove (5) and the guide block (4) are both stepped. The guide groove (5) comprises a small diameter section I (51) and a large diameter section I (52). The guide block (4) comprises a small diameter section II (41) and a large diameter section II (42). The two upper and lower walls of the small diameter section I (51) respectively abut against the upper and lower surfaces of the small diameter section II. The four wall surfaces of the large diameter section I (52) respectively abut against the four wall surfaces of the large diameter section II (42). The small diameter section I (51) is close to the straight surface of the fixing portion (211) relative to the large diameter section I (52).