Reducing rod die

Abstract

The invention relates to the technical field of metal part machining and manufacturing, in particular to a reducing rod die. The reducing rod mold comprises a first mold shell, a second mold shell and a mold core fixedly assembled in the second mold shell, the first mold shell and the second mold shell are independent of each other, the mold core is provided with a forming cavity used for forming a product, the first mold shell and the second mold shell are detachably connected so that the first mold shell can be shared by different second mold shells, and the second mold shells can be independently replaced. Compared with an existing integral reducing rod die, on the premise that the number of the dies is the same, the first die shells can be greatly saved, only the second die shells with the needed number need to be arranged, and therefore the workshop area occupied by the dies can be greatly reduced, and the die input cost is reduced. When the forming cavity is abraded, only the second mold shell and the mold core need to be replaced, and the first mold shell does not need to be replaced, so that the product hole shrinkage machining cost is greatly reduced.

Description

Technical Field

[0001] The invention relates to the technical field of metal component processing and manufacturing, in particular to a reduced-diameter rod die. Background Art

[0002] Common fasteners such as cross recessed pan head screws and hexagon socket head screws have different strength requirements based on different application scenarios. In the fields of aerospace, automobile manufacturing, etc., they are required to have a higher strength grade. The screw fasteners processed from TB3 raw materials have a strength grade of up to 1100Mpa, which can meet the high strength grade requirements. The cold heading process is usually used when the screws are processed and formed. For the processing of the screw rod, the blank needs to be squeezed and deformed by cold heading to reduce the diameter of the blank to the required size (that is, the rod diameter of the standard specification screw). This process requires the use of a reducing rod die. The structure of the existing reducing rod die is as follows: Figure 1 As shown, it includes a mold shell 1, a mold core 2 and a material stripping rod 3. The mold core 2 is fixedly assembled inside the mold shell 1. The mold core 2 is provided with a forming cavity 4 for reducing the diameter of the blank. The mold shell 1 is provided with a through hole connected to the forming cavity 4 for the material stripping rod 3 to move in and out. After the diameter reduction processing in the forming cavity 4 is completed, the blank is ejected by the material stripping rod 3. During upsetting, the mold core needs to withstand a large upsetting force. Therefore, the mold core is usually made of superhard material, and the mold core is interference fit in the mold shell to ensure that the mold core will not loosen, thereby ensuring the product processing accuracy and avoiding the mold core being pulled out due to excessive friction between the product and the mold core during material stripping. Since there are many specifications of screw products and the batch quantity is large, a large number of molds are required, resulting in the mold occupying a large area of ​​the factory area and the mold investment cost is high. In addition, the molding cavity will inevitably wear during use, which will affect the product processing quality. Therefore, the mold must be replaced as a whole every once in a while, further increasing the product diameter reduction processing cost. Summary of the Invention

[0003] The purpose of the present invention is to provide a reducing rod mold to solve the problem that when using existing reducing rod molds to reduce the diameter of products, due to the large number of product specifications and large batch quantities, a large number of molds are required, resulting in the molds occupying a large area of ​​the factory and high mold investment costs.

[0004] To achieve the above-mentioned purpose, the reduced diameter rod mold of the present invention adopts the following technical solutions: A reduced diameter rod mold includes a first mold shell, a second mold shell and a mold core fixedly assembled in the second mold shell. The mold core has a molding cavity for molding the product. The first and second mold shells are detachably connected so that the first mold shell can be shared by different second mold shells and the second mold shells can be replaced separately.

[0005] Furthermore, the first and second mold shells are fixedly connected by bolts.

[0006] Furthermore, the first mold shell is located on the rear side of the second mold shell, a bolt through hole is provided on the first mold shell, and a threaded hole is provided on the second mold shell. The bolt passes through the bolt through hole of the first mold shell from back to front and is tightened in the threaded hole of the second mold shell to achieve a fixed connection between the first and second mold shells.

[0007] Furthermore, a recessed groove is provided on the first mold shell at the rear end opening of the bolt hole, and the head of the bolt is sunk into the recessed groove.

[0008] Furthermore, there are more than two bolts and they are evenly spaced around the axis of the first mold shell.

[0009] Furthermore, the bolt is a hexagon socket head bolt.

[0010] Furthermore, the first and second mold shells are coaxial.

[0011] Furthermore, the reduced diameter rod mold also includes a return rod, and the first and second mold shells are provided with a return rod channel for the return rod to move through. The return rod channel is connected to the molding cavity so that the product can be ejected from the mold through the return rod after molding is completed.

[0012] Furthermore, the forming cavity includes a diameter-reducing forming section and a front-end guide section located in front of the diameter-reducing forming section, and the front-end guide section is used to guide the blank into the forming cavity.

[0013] Beneficial Effects: This invention is a pioneering invention. The present invention's reducing rod mold is a spliced ​​reducing rod mold, which divides the mold shell into two independent first and second mold shells. The mold core is fixedly assembled in the second mold shell. The first and second mold shells are detachably connected. The first mold shell is a common mold shell, and the second mold shell can be replaced separately. Compared with the existing integral reducing rod mold, under the premise of the same number of molds, a large number of first mold shells can be saved, and only the required number of second mold shells need to be configured. Therefore, the area occupied by the mold in the factory and the mold investment cost can be greatly reduced. When the molding cavity is worn, only the second mold shell and the mold core need to be replaced, and the first mold shell does not need to be replaced, thereby greatly reducing the cost of product reduction processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of an existing reduced diameter rod mold; Figure 2 Schematic diagram of the structure of an embodiment of a reduced diameter rod mold of the present invention; Figure 3 Schematic diagram of the structure of the first mold shell; Figure 4 It is a left view of the first mold shell; Figure 5 Schematic diagram of the structure of the second mold shell; Figure 6 It is the left view of the second mold shell; Figure 7 for Figure 5 The enlarged schematic diagram of M in the middle; Figure 8 It is a structural diagram of the bolt; Figure 9 Schematic diagram of the structure of the ejector rod; In the figure: 1. mold shell; 2. mold core; 3. ejector rod; 4. molding cavity; 5. first mold shell; 6. bolt through hole; 7. countersunk groove; 8. second mold shell; 9. threaded hole; 10. bolt; 11. ejector rod channel; 12. rod body; 13. push operation part; 14. front end guide section; 15. reduced diameter molding section; 16. through hole. DETAILED DESCRIPTION

[0015] In the prior art, the rod reduction mold used for reducing the diameter of the screw shank is an integral structure. Due to the large number of screw product specifications and large batch quantities, a large number of molds are required, resulting in a large area of ​​factory space occupied by the molds and high mold investment costs. In addition, to ensure processing quality, the molds must be replaced as a whole at regular intervals, further increasing the cost of product reduction processing. To solve this problem, the present invention provides a rod reduction mold, which divides the mold shell into two independent first and second mold shells. The mold core is fixedly assembled in the second mold shell. The first and second mold shells are detachably connected. The first mold shell is a shared mold shell, and the second mold shell can be replaced separately. In this way, under the premise of the same number of molds, a large number of first mold shells can be saved, and only the required number of second mold shells need to be configured, thereby reducing the area of ​​factory space occupied by the molds and reducing the mold investment costs. When the molding cavity is worn, there is no need to replace the mold as a whole. Only the second mold shell and the mold core need to be replaced, thereby reducing the cost of product reduction processing.

[0016] Based on the above-mentioned inventive concept, an embodiment of the reduced diameter rod mold of the present invention is described in detail below.

[0017] like Figure 2 As shown, the diameter reduction rod mold of the present invention includes a mutually independent first mold shell 5, a second mold shell 8, and a mold core 2 fixedly assembled in the second mold shell 8. The mold core 2 adopts interference assembly to ensure that the mold core 2 will not loosen. The mold core 2 has a molding cavity 4 for performing diameter reduction molding on the product rod portion. The first and second mold shells are fixedly connected by bolts 10 to achieve splicing assembly of the diameter reduction rod mold. The first mold shell 5 is a common mold shell that can be shared by different second mold shells 8, and the second mold shell 8 can be replaced separately. In this way, a large number of first mold shells 5 can be saved, and only the required number of second mold shells 8 need to be configured, which greatly reduces the area of ​​the factory building occupied by the mold and reduces the mold investment cost; when the molding cavity 4 is worn, there is no need to replace the mold as a whole, only the second mold shell 8 and the mold core 2 need to be replaced, thereby achieving the purpose of reducing the product diameter reduction processing cost.

[0018] The first mold shell 5 and the second mold shell 8 are fixedly connected by bolts 10 to ensure the connection reliability and make the disassembly and assembly of the first and second mold shells more convenient. Figure 3-4 As shown, the first mold shell 5 is provided with a bolt through hole 6 extending along its axial direction. The structure of the second mold shell 8 is as shown in FIG. Figure 5-6 As shown, the second mold shell 8 is provided with a threaded hole 9. Figure 2 As shown, the first mold shell 5 is located at the rear side of the second mold shell 8. The bolts 10 pass through the bolt holes 6 of the first mold shell 5 from the back to the front and are tightened into the threaded holes 9 of the second mold shell 8 to achieve a fixed connection between the first and second mold shells. The blank extends from the front end into the forming cavity 4 of the second mold shell 8. The cold heading machine forges the blank from the front side of the mold. The bolts 10 are inserted from the rear side of the mold to fix the first and second mold shells together, which can avoid interference with the cold heading machine. Figure 3 As shown in the figure, a recessed groove 7 is provided at the rear end opening of the bolt through hole 6 on the first mold shell 5, and the head of the bolt 10 is sunk into the recessed groove 7 to avoid the head of the bolt 10 being exposed and interfering with surrounding components, while also avoiding the head of the bolt 10 being exposed and occupying additional space.

[0019] In order to ensure the connection reliability between the first and second mold shells and thus ensure the product processing effect, two bolts 10 are provided and arranged symmetrically about the axis of the first mold shell 5. The bolts 10 are specifically hexagon socket head bolts, and their structure is as follows: Figure 8 As shown, a threaded section is provided at the end of the rod, which allows for easy installation and removal with the aid of a wrench. The first and second mold shells are coaxial to further ensure uniform load-bearing between the first and second mold shells. The first mold shell 5 can provide uniform and reliable support for the second mold shell 8, avoiding reduced mold service life due to uneven load.

[0020] Of course, in other embodiments, the first and second mold shells can also be directly threadedly connected. For example, a threaded hole is provided at the front end of the first mold shell 5, and an external thread is provided at the rear end of the second mold shell 8, so that the rear end of the second mold shell 8 is directly threadedly connected to the front end of the first mold shell 5. In other embodiments, the first and second mold shells can also be connected by snap-fitting. The snap-fitting is an elastic snap-fitting. Pressing the elastic snap-fitting can separate the first and second mold shells. In other embodiments, bolt through-holes can also be provided on the second mold shell 8, and screw holes can be provided on the first mold shell 5. The bolts are passed from front to back through the bolt through-holes on the second mold shell 8 and tightened into the screw holes on the first mold shell 5 to achieve a fixed connection between the first and second mold shells. At this time, the bolt heads can be sunk into the second mold shell 8 to avoid interference with the front cold heading machine. In addition, the number of bolts is not limited and can be more than three, so that all bolts are evenly spaced around the axis of the first mold shell to ensure connection reliability. In other embodiments, the bolts can also be cross-recessed pan head bolts, internal square cylindrical head bolts, etc.

[0021] like Figure 7 As shown in the figure, the forming cavity 4 includes a reduced diameter forming section 15 and a front guide section 14 located in front of the reduced diameter forming section 15. The diameter of the reduced diameter forming section 15 is designed based on the shank diameter of standard screw products. The blank deforms as it passes through the reduced diameter forming section 15, and the diameter reaches the required size after forming. The front guide section 14 is a tapered section with a thicker front and a thinner back, which is used to guide the blank into the forming cavity 4, allowing it to enter the forming cavity 4 quickly and improving processing efficiency.

[0022] The reduced diameter rod mold also includes a stripping rod 3, the structure of which is as follows: Figure 9 As shown, the ejector rod 3 is an integrally formed structure, including a rod body 12 and a push operation portion 13 connected to one end of the rod body 12. Figure 3 、 Figure 5 As shown, the first mold shell 5 and the second mold shell 8 are provided with a material return rod channel 11 for the material return rod 3 to move through. The material return rod channel 11 is located in the central area of ​​the mold shell 1 and is connected to the molding cavity 4 on the mold core 2. The molding cavity 4 is opened in the front center area of ​​the mold core 2, and the mold core 2 is provided with a through hole 16 connected to the molding cavity 4. Figure 7 As shown, the through hole 16 can also be used for the ejection rod 3 to move through. The through hole 16 is aligned and connected with the ejection rod channel 11 on the first mold shell 5 and the second mold shell 8. After the molding is completed, the ejection rod 3 is inserted into the ejection rod channel 11, and the product is ejected from the mold through the ejection rod 3 to realize the ejection of the material.

[0023] The reducing rod mold of the present invention is a spliced ​​structure. Compared with the existing integral reducing rod mold, it can greatly reduce the mold cost, reduce the area of ​​the factory area occupied by the mold and reduce the mold investment cost; and when the molding cavity 4 is worn, there is no need to replace the mold as a whole, only the second mold shell 8 and the mold core 2 need to be replaced, thereby greatly reducing the product reduction processing cost.

[0024] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be based on the claims. Any equivalent structural changes made using the description and drawings of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A reduced diameter rod mold, characterized in that: It includes a first mold shell, a second mold shell and a mold core fixedly assembled in the second mold shell. The mold core has a molding cavity for molding the product. The first and second mold shells are detachably connected so that the first mold shell can be shared by different second mold shells and the second mold shells can be replaced separately.

2. The reduced diameter rod mold according to claim 1, characterized in that: The first and second mold shells are fixedly connected by bolts.

3. The reduced diameter rod mold according to claim 2, characterized in that: The first mold shell is located at the rear side of the second mold shell. The first mold shell is provided with a bolt through hole, and the second mold shell is provided with a threaded hole. The bolt passes through the bolt through hole of the first mold shell from back to front and is tightened in the threaded hole of the second mold shell to achieve a fixed connection between the first and second mold shells.

4. The reduced diameter rod mold according to claim 3, characterized in that: A sinking groove is provided on the first mold shell at the rear end opening of the bolt penetration hole, and the head of the bolt sinks into the sinking groove.

5. The reduced diameter rod mold according to any one of claims 2 to 4, characterized in that: There are more than two bolts and they are evenly spaced around the axis of the first mold shell.

6. The reduced diameter rod mold according to any one of claims 2 to 4, characterized in that: The bolts are hexagon socket head bolts.

7. The reduced diameter rod mold according to any one of claims 1 to 4, characterized in that: The first and second mold shells are coaxial.

8. The reduced diameter rod mold according to any one of claims 1 to 4, characterized in that: The reduced diameter rod mold also includes a material return rod. The first and second mold shells are provided with a material return rod channel for the material return rod to move through. The material return rod channel is connected to the molding cavity so that the product can be ejected from the mold through the material return rod after molding is completed.

9. The reduced diameter rod mold according to any one of claims 1 to 4, characterized in that: The forming cavity comprises a diameter-reducing forming section and a front-end guiding section located in front of the diameter-reducing forming section, and the front-end guiding section is used for guiding the blank to enter the forming cavity.

Images