Bolt trimming die with deburring structure

Abstract

A bolt trimming die with a deburring structure comprises an upper die and a lower die, and a trimming die is fixed to the lower end of the upper die. A nut prefabricating groove is formed in the position, corresponding to the trimming die, of the lower die, the top edge of the nut prefabricating groove is machined to be sharp to form a cutting edge, and the nut prefabricating groove and the trimming die are consistent in shape and similar in size; a machining through hole used for containing a bolt is formed in the nut prefabricating groove, and the lower end of the machining through hole is slidably connected with an ejector rod. And when the bolt is subjected to edge cutting operation, a gap of at least 0.1 mm is always kept between the edge cutting die and the top of the nut prefabricating groove. According to the bolt trimming die, the nut prefabricating groove is formed in the lower die body of the bolt trimming die, the cutting edge on the top of the nut prefabricating groove is matched with the cutting edge of the trimming die to cut burrs bidirectionally, the cutting effect is good, and the cutting speed is high; the cutting edge at the top of the nut prefabricating groove is matched with the cutting edge of the trimming die in size, but a gap is reserved, the cutting edges are prevented from being directly extruded and collided, and the service life of the die is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of mold design, in particular to a bolt trimming mold with a deburring structure. Background Art

[0002] Bolt trimming refers to the process of trimming and shaping the bolt head during the production process to ensure that it meets specific size and shape requirements. This process is usually completed using a trimming die, which can be in a hexagonal, square or rectangular shape.

[0003] Commonly used square, hexagonal and octagonal bolts are prone to retain burrs at the end of the trimming process according to the traditional trimming process. The remaining burrs will seriously affect the appearance and performance of the bolts and need to be removed. Currently, the most commonly used methods for removing burrs are mainly the following two:

[0004] The first method is to fit the upper trimming die and the lower main die tightly together during the trimming process, and increase the extrusion pressure between the upper and lower dies to eliminate the burrs. However, this method will aggravate the damage of the mold, reduce its service life, and the burr removal effect is generally poor.

[0005] The second method is to remove the burrs by turning and grinding after trimming. This method has good effect but will greatly increase the product cost. It will also increase the trimming time and reduce production efficiency.

[0006] Therefore, in view of the shortcomings of the prior art, it is necessary to design a bolt trimming die with a deburring structure to solve the above problems.

[0007] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solution of the utility model and facilitating the understanding of those skilled in the art. It cannot be considered that the above contents are well known to those skilled in the art simply because they are explained in the background technology of the utility model. Utility Model Content

[0008] In order to overcome the above-mentioned deficiencies in the prior art, the utility model aims to disclose a bolt trimming die with a burr removal structure, which is used to solve the problem that burrs are easily left after bolt trimming.

[0009] The utility model discloses a bolt trimming die with a deburring structure, comprising an upper die and a lower die, wherein the trimming die is fixed at the lower end of the upper die; the lower die is provided with a nut prefabricated groove at a position corresponding to the trimming die, the top edge of the nut prefabricated groove is processed to be sharp to form a cutting edge, the nut prefabricated groove is consistent in shape with the trimming die and their sizes are similar; during the trimming process, the nut of the bolt forms a nut base at the nut prefabricated groove under the action of pressure, and when the trimming die is pressed down to the bottom, due to the nut prefabricated groove The cutting edge at the top is arranged corresponding to the cutting edge of the trimming die, so that the burrs punched out by the trimming die are clamped between the cutting edge at the top of the nut prefabricated groove and the cutting edge of the trimming die; a processing through hole for accommodating bolts is opened in the nut prefabricated groove, and a push rod is slidably connected to the lower end of the processing through hole. When the trimming die descends, the push rod supports the bolt to keep it in a fixed position. When the trimming die descends to the bottom, the push rod pushes the bolt, and the clamped burrs are cut off under the action of the upper and lower cutting edges.

[0010] The preferred technical solution is that the size difference between the opposite sides of the nut prefabricated groove and the trimming die is less than or equal to 0.25 mm, so that the distance between the cutting edges of the nut prefabricated groove and the trimming die does not exceed a certain range, thereby ensuring the cleaning effect of the bolt burrs.

[0011] Optimal technical solution: The depth of the nut prefabricated groove is 0.6mm-0.8mm. The bolt can easily fill the nut prefabricated groove of this depth under pressure, reducing the fitting gap between the cutting edge of the nut prefabricated groove and the bolt, and improving the burr removal effect.

[0012] Optimal technical solution: The nut precast groove has a tapered structure that is narrow at the bottom and wide at the top, which reduces the difficulty of filling the bolt in the nut precast groove and improves the processing quality.

[0013] Preferred technical solution: When the bolt is trimmed, a gap of at least 0.1 mm is always maintained between the trimming die and the top of the nut prefabricated groove to avoid extrusion and collision between the trimming die and the cutting edge of the nut prefabricated groove, thereby increasing the service life of the die.

[0014] Due to the application of the above technical solution, the bolt trimming die with a deburring structure of the utility model has the following beneficial effects:

[0015] (1) By setting a nut prefabricated groove at the lower die of the bolt trimming die, and using the cutting edge at the top of the nut prefabricated groove to cooperate with the cutting edge of the trimming die to perform bidirectional cutting of the burrs, the cutting effect is good and the speed is fast;

[0016] (2) The cutting edge of the top of the nut prefabricated groove and the cutting edge of the trimming die are similar in size but still leave a gap to avoid direct extrusion and collision between the cutting edges of the two, thereby increasing the service life of the mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the bolt after trimming in the utility model;

[0018] Figure 2 This is a schematic diagram of the structure of a bolt trimming die with a deburring structure according to the utility model;

[0019] Figure 3 This is a longitudinal sectional view of a bolt trimming die with a deburring structure according to the utility model;

[0020] Figure 4 It is a structural schematic diagram of the lower mold in the utility model;

[0021] Figure 5 for Figure 4 A partial enlarged view of point A in the middle.

[0022] In the above figures, 1, upper die; 11, trimming die; 2, lower die; 21, prefabricated groove for nut; 22, processed through hole; 23, ejector rod; 3, bolt; 31, prefabricated hexagon. DETAILED DESCRIPTION

[0023] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0024] In the description of the present utility model, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, terms such as "horizontal", "vertical", and "overhanging" do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0025] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connected" and "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, it can be an electrical connection, it can be a direct connection, it can be indirectly connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] Example:

[0027] like Figure 2 and Figure 3 As shown, the utility model discloses a bolt trimming die with a deburring structure, comprising an upper die 1 and a lower die 2. The main components of the utility model are described in detail below:

[0028] like Figure 2 and Figure 3 As shown, in this embodiment, a trimming die 11 is fixed to the lower end of the upper die 1 .

[0029] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, in the present embodiment, the lower die 2 and the trimming die 11 are provided at the corresponding positions thereof with electric spark discharge to form a nut prefabricated groove 21, the depth of the nut prefabricated groove 21 is 0.6 mm and it is a tapered structure which is narrow at the bottom and wide at the top; a cutting edge is provided on the top edge of the nut prefabricated groove 21, the nut prefabricated groove 21 is consistent in shape with the trimming die 11, and the nut prefabricated groove 21 is 0.25 mm smaller than the opposite side dimension of the trimming die 11, a machining through hole 22 for accommodating the bolt 3 is provided in the nut prefabricated groove 21, a top rod 23 is slidably connected to the lower end of the machining through hole 22, and when the bolt trimming die is adjusted so that the bolt 3 is trimmed, the trimming die 11 and the top of the nut prefabricated groove 21 always maintain a gap of 0.1 mm. It should be noted that the above structure is merely illustrative and not restrictive. In the present embodiment, the nut prefabricated groove 21 is 0.25 mm smaller than the opposite side dimension of the trimming die 11; however, in other embodiments, the opposite side dimension of the nut prefabricated groove 21 may also be larger than the opposite side dimension of the trimming die 11. As long as the difference does not exceed 0.25 mm, the processing effect can be guaranteed.

[0030] like Figure 1 As shown, in this embodiment, the bolt 3 is a hexagonal bolt. It should be noted that in this embodiment, the bolt 3 is a hexagonal bolt; but in other embodiments, the bolt 3 can also be a square bolt or an octagonal bolt.

[0031] refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, the principle of the bolt trimming die with a deburring structure of the utility model is as follows: when the trimming die 11 is pressed down to contact the bolt 3, the bolt 3 forms a prefabricated hexagon 31 at the nut prefabricated groove 21 under the action of pressure, and when the trimming die 11 cuts into the position of the prefabricated hexagon 31, the cutting edge of the trimming die 11 and the cutting edge at the top of the nut prefabricated groove 21 clamp the generated burrs at the top of the prefabricated hexagon 31, and at this time, the top rod 23 moves forward to cut off the burrs under the action of the cutting edges on the upper and lower sides. In this process, because there is a gap of 0.1mm between the cutting edge of the trimming die 11 and the cutting edge at the top of the nut prefabricated groove 21, it will not be squeezed and collided, and its service life will be improved while maintaining the cutting effect.

[0032] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A bolt trimming die with a deburring structure, comprising an upper die (1) and a lower die (2), characterized in that: A trimming die (11) is fixed at the lower end of the upper die (1); a nut prefabricated groove (21) is provided at a position corresponding to the trimming die (11) of the lower die (2); a cutting edge is provided at the top edge of the nut prefabricated groove (21); the nut prefabricated groove (21) and the trimming die (11) are of the same shape and similar size; a machining through hole (22) for accommodating a bolt (3) is provided in the nut prefabricated groove (21); a push rod (23) is slidably connected to the lower end of the machining through hole (22).

2. The bolt trimming die with a deburring structure according to claim 1, characterized in that: The difference in size between the nut prefabricated groove (21) and the opposite side of the trimming die (11) is less than or equal to 0.25 mm.

3. The bolt trimming die with a deburring structure according to claim 2, characterized in that: The depth of the nut prefabricated groove (21) is between 0.6 mm and 0.8 mm.

4. The bolt trimming die with a deburring structure according to claim 3, characterized in that: The nut prefabricated groove (21) is a tapered structure that is narrow at the bottom and wide at the top.

5. The bolt trimming die with a deburring structure according to claim 4, characterized in that: When the bolt (3) is trimmed, a gap of at least 0.1 mm is always maintained between the trimming die (11) and the top of the nut prefabricated groove (21).

Images