Blank manufacturing device of blank for extruding pipe
Through the clearance fit between the reaming die and the core rod and the step structure design, the problem of insufficient piercing force of the extruded pipe blank is solved, crack-free reaming and high-precision forming are achieved, and the quality of the blank is improved.
Patent Information
- Application Number
- CN202422731426.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-11
- Publication Date
- 2025-09-16
- Estimated Expiration
- 2034-11-11
AI Technical Summary
In the existing technology, the extruded pipe blank has insufficient punching force during punching, especially for materials that resist deformation, resulting in defects such as cracks on the blank surface, making it difficult to meet the extrusion molding requirements.
The inner ring of the reaming die is used to achieve clearance fit with the core rod. The outer circle of the upper end face of the reaming needle is provided with a step structure to match the step of the lower end face of the reaming die. The combination of the ring-shaped reaming die and the rod-shaped core rod can improve the piercing force and ensure the stability and accuracy of the reaming process.
The blank can be expanded without cracks in one operation, which improves the surface quality and expansion accuracy of the blank, reduces the piercing force and avoids surface defects.
Smart Images
Figure CN223338074U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of extrusion production of pipes, in particular to a blank making device for extruding pipe blanks. Background Art
[0002] Extrusion is a plastic forming method in which an external force is applied from one end to a metal ingot placed in a container (extrusion cylinder) to force it to flow out of a specific die hole to obtain a product with the required cross-sectional shape and size.
[0003] Pipes can be produced by extrusion. For extruded pipes, a billet with holes must be prefabricated first. The billet is placed in the extrusion barrel of an extruder and extruded into a tube. The prefabricated holes on the billet are formed by punching with a billet making machine. It is difficult to form a hole larger than the outer diameter of the billet in one go, that is, a billet with a perforation ratio (outer diameter of the billet divided by the diameter of the hole to be punched) less than 2 is punched. The punching force is large, especially for materials with large deformation resistance. The punching force for punching large holes will be very large, and the pressure of the billet making machine will not be able to meet the punching needs. In addition, due to the large deformation of the material, cracks and other defects will appear on the billet surface, which is difficult to meet the needs of extrusion.
[0004] To this end, we provide a billet making device for extruding billets for pipes to solve the above problems. Utility Model Content
[0005] The purpose of the utility model is to provide a blank making device for extruded pipes, in which a clearance fit is achieved between the inner ring of the reaming die and the core rod, the reaming needle is an annular structure, and a step structure is provided on the outer circle of the upper end face to cooperate with the lower end face of the reaming die, thereby improving the piercing force during blank making and solving the problem of defects such as cracks on the surface of the existing blank.
[0006] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:
[0007] The utility model is a blank-making device for extruding billets for pipes, comprising a blank-making machine, a power end of the blank-making machine is provided with a slide plate, the end of the slide plate is provided with a pad, a blank-making cylinder is provided on the pad, a core rod is provided inside the pad, and a reaming needle is provided on the blank-making machine.
[0008] The utility model is further configured such that the slide plate can slide horizontally, and the slide plate is divided into two parts and is installed on the blank making machine.
[0009] The utility model is further configured such that the pad is an annular structure, the inner hole and the outer circle are provided with a step structure, the inner step cooperates with the core rod, the outer step cooperates with the hole expansion die, and the pad is installed on the blank making machine.
[0010] The utility model is further configured as follows: the core rod has a rod-shaped step structure, the outer diameter of the small end of the core rod is determined according to the inner diameter of the pre-punched hole of the blank, the outer diameter of the small end of the core rod is clearance-matched with the inner hole of the reaming die and the inner hole of the upper pad, the length of the outer diameter of the small end of the core rod in the reaming die is greater than the height of the blank, and the outer diameter of the large end of the core rod is matched with the inner hole of the pad.
[0011] The utility model is further configured such that the reaming die is an annular structure with a conical outer circle, the inner hole and the core rod are clearance-fitted, a step structure is provided on the lower end face of the inner hole to match the step structure on the upper end face of the reaming needle, the outer diameter of the reaming die is determined according to the reaming requirements of the blank, the inner diameter of the blank-making cylinder is determined according to the outer diameter of the pad, and the reaming die is placed on the upper end face of the reaming needle.
[0012] The utility model is further configured such that the reaming needle is a tubular structure, the outer circle of the upper end face is provided with a step structure which cooperates with the step of the lower end face of the reaming die, the outer diameter of the reaming needle is smaller than the outer diameter of the reaming die, the inner diameter of the reaming needle is greater than or equal to the inner diameter of the reaming die, and the reaming needle is installed on the blank making machine.
[0013] The utility model has the following beneficial effects:
[0014] 1. The utility model allows the expansion of the blank in one operation. The expansion die is an annular structure with a conical outer circle. The inner hole and the core rod are clearance-matched. The expansion needle is a tubular structure with a step structure on the outer circle of the upper end face that matches the step on the lower end face of the expansion die. This design reduces the piercing force during blank making, avoids defects such as cracks on the blank surface, and improves the quality of the blank surface.
[0015] 2. The mandrel of the utility model is a rod-shaped step structure. The outer diameter of the small end is determined according to the inner diameter of the pre-punched hole of the blank. It is clearance-matched with the inner hole of the reaming die and the inner hole of the upper pad. The upper pad is an annular structure, and the inner hole and outer circle are provided with a step structure. The inner step cooperates with the mandrel, and the outer step cooperates with the blank making cylinder. This cooperation method ensures the stability of the reaming process and improves the accuracy of reaming.
[0016] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0018] Figure 1 The figure is a schematic structural diagram of a device for making a billet for extruding a pipe.
[0019] Figure 2 This is a partial structural schematic diagram of a billet-making device for extruding a billet for pipes.
[0020] Figure 3 Schematic diagram of pre-punched blank.
[0021] Figure 4 Schematic diagram of the expansion die without blank placed in it.
[0022] Figure 5 This is a schematic diagram of the unprocessed blank after being placed in the expansion die.
[0023] Figure 6 Schematic diagram of the blank expansion process.
[0024] Figure 7 Schematic diagram of the bottom cutting after the blank is expanded.
[0025] Figure 8 Schematic diagram of the blank after hole expansion.
[0026] In the accompanying drawings, the components represented by the reference numerals are as follows:
[0027] 1. Slide plate; 2. Pad; 3. Mandrel; 4. Blanking tube; 5. Reaming die; 6. Reaming needle. DETAILED DESCRIPTION
[0028] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0029] Example 1
[0030] See also Figure 1-8 The utility model is a blank-making device for extruding billets for pipes, including a blank-making machine, a slide 1 is provided at the power end of the blank-making machine, a pad 2 is provided at the end of the slide 1, a blank-making cylinder 4 is provided on the pad 2, a core rod 3 is provided inside the pad 2, and a reaming needle 6 is provided on the blank-making machine.
[0031] Specifically, the slide plate 1 can slide horizontally, and the slide plate 1 is divided into two pieces and installed on the blank making machine. The pad 2 is an annular structure, and the inner hole and outer circle are provided with a step structure. The inner step cooperates with the core rod 3, and the outer step cooperates with the reaming die 5. The pad 2 is installed on the rod-shaped step structure of the core rod 3 on the blank making machine. The outer diameter of the small end of the core rod 3 is determined according to the inner diameter of the pre-punched hole of the blank. The outer diameter of the small end of the core rod 3 is clearance-matched with the inner hole of the reaming die 5 and the inner hole of the upper pad 2. The length of the outer diameter of the small end of the core rod 3 in the reaming die 5 is greater than the height of the blank, and the outer diameter of the large end of the core rod 3 is matched with the inner hole of the pad 2.
[0032] Furthermore, the reaming die 5 is an annular structure with a conical outer circle, and the inner hole and the core rod 3 are clearance-fitted. A step structure is provided on the lower end face of the inner hole to match the step structure on the upper end face of the reaming needle 6. The outer diameter of the reaming die 5 is determined according to the reaming requirements of the blank, and the inner diameter of the blank making tube 4 is determined according to the outer diameter of the pad 2. The reaming die 5 is placed on the reaming needle 6. The reaming needle 6 is a tubular structure, and a step structure is provided on the outer circle of the upper end face to match the step on the lower end face of the reaming die 5. The outer diameter of the reaming needle 6 is smaller than the outer diameter of the reaming die 5, and the inner diameter of the reaming needle 6 is greater than or equal to the inner diameter of the reaming die 5. The reaming needle 6 is installed on the blank making machine.
[0033] The operation process of this embodiment is as follows: first, the blank is heated, and then the reaming die is installed. The core rod 3 is first installed on the movable beam, and then the pad 2 is sleeved on the outside of the core rod 3. That is, after the slide 1, pad 2, and core rod 3 are assembled, they are set on the movable beam and can move up and down. Then the blank making cylinder 4 is installed on the locking slide of the blank making machine, and can also move up and down. In addition, the reaming needle 6 is fixed on the base of the blank making machine, and the reaming die 5 is placed on the upper end surface of the reaming needle 6. Then the blank making cylinder 4 is controlled to move downward so that the blank is placed inside it from the upper end of the blank making cylinder 4, and the blank is located in the reaming cylinder 4. The upper end of the hole die 5 is then controlled to move the core rod 3 downward so that it is inserted into the inner hole of the blank, the inner hole of the reaming die 5 and the inner hole of the reaming needle 6, and then the movable beam is controlled to move downward to complete the reaming. After the reaming is completed, the slide 1 is controlled to move to both sides so that the distance between the two slides 1 is greater than the diameter of the large end of the core rod 3, and then stops moving. The movable beam is then controlled to continue to move downward so that the reaming die 5 enters the interior of the pad 2 and cuts off the remaining bottom, thereby completing the reaming of the blank. The movable beam is then controlled to move upward, and the slide 1, pad 2, core rod 3 and blank making cylinder 4 move upward and disengage from the reaming die 5, and then the reamed blank is taken out.
[0034] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
[0035] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments do not describe all details in detail, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.
Claims
1. A device for making a billet for extruded pipes, characterized in that: The invention comprises a blank making machine, wherein a slide plate (1) is provided at the power end of the blank making machine, a pad plate (2) is provided at the end of the slide plate (1), a blank making cylinder (4) is provided on the pad plate (2), a core rod (3) is provided inside the pad plate (2), and a reaming needle (6) is provided on the blank making machine.
2. The device for making a billet for extruded pipe according to claim 1, characterized in that: The slide plate (1) slides horizontally, and the slide plate (1) is divided into two parts and is installed on a blank making machine.
3. The device for making a billet for extruded pipe according to claim 1, characterized in that: The pad (2) is an annular structure, with a step structure provided on the inner hole and the outer circle, the inner step cooperates with the core rod (3), and the outer step cooperates with the hole expansion die (5), and the pad (2) is installed on a blank making machine.
4. The device for making a billet for extruded pipe according to claim 1, characterized in that: The core rod (3) has a rod-shaped step structure, the outer diameter of the small end of the core rod (3) is determined according to the inner diameter of the pre-punched hole of the blank, the outer diameter of the small end of the core rod (3) is clearance-matched with the inner hole of the expansion die (5) and the inner hole of the upper pad (2), the length of the outer diameter of the small end of the core rod (3) in the expansion die (5) is greater than the height of the blank, and the outer diameter of the large end of the core rod (3) is matched with the inner hole of the pad (2).
5. The device for making a billet for extruded pipe according to claim 4, characterized in that: The reaming die (5) is an annular structure with a conical outer circle. The inner hole and the core rod (3) are clearance-matched. The lower end face of the inner hole is provided with a step structure to match the step structure of the upper end face of the reaming needle (6). The outer diameter of the reaming die (5) is determined according to the reaming requirements of the blank. The inner diameter of the blank making cylinder (4) is determined according to the outer diameter of the backing plate (2). The reaming die (5) is placed on the upper end face of the reaming needle (6).
6. The device for making a billet for extruded pipe according to claim 5, characterized in that: The reaming needle (6) is a tubular structure, and a step structure is provided on the outer circle of the upper end surface to match the step of the lower end surface of the reaming die (5). The outer diameter of the reaming needle (6) is smaller than the outer diameter of the reaming die (5), and the inner diameter of the reaming needle (6) is greater than or equal to the inner diameter of the reaming die (5). The reaming needle (6) is installed on the blank making machine.