A bolt head press machine

Abstract

The application relates to the technical field of bolt processing equipment, in particular to a bolt head press-fitting machine. In the bolt head press-fitting machine provided in the embodiment of the application, a cooling cavity is arranged around a hexagonal groove of an inner base, and overflow holes are further arranged on the top surface of the inner base and distributed along the hexagonal groove. A return liquid cavity is formed between the inner base and the bottom of an outer base, and a return plate connected between the inner base and the outer base is provided with a return liquid hole communicating with the return liquid cavity in the thickness direction. Moreover, a tank is in communication with the cooling cavity and the return liquid cavity through a liquid inlet pipe. In this way, the closed circulation system of the liquid inlet pipe, the cooling cavity, the overflow hole, the liquid storage tank, the return liquid hole, the return liquid cavity, the return liquid and the tank can ensure that the cooling liquid uniformly covers the hexagonal groove area of the hot upsetting die and the hot upsetting die is cooled through the flowing cooling liquid. The structure design can not only save the use of the cooling liquid, but also improve the cooling effect of the hot upsetting die.

Description

Technical Field

[0001] This application relates to the field of bolt processing equipment technology, and more specifically, to a bolt head press-fitting machine. Background Technology

[0002] Bolts are commonly used fasteners in mechanical manufacturing. Their processing requires multiple steps to ensure dimensional accuracy, mechanical properties, and surface quality.

[0003] In related technologies, the forming of bolt heads mainly adopts the upsetting process. The upsetting process can be divided into cold upsetting and hot upsetting according to the material properties and bolt specifications. Hot upsetting is mainly used for bolts with larger diameters or high-strength alloys. In the actual processing, the bolt blank needs to be heated to the forging temperature first, and then the head shape is upsetting through a hot upsetting die.

[0004] In actual machining, hot forging requires heating the bolt blank to a high temperature before forging it into a hexagonal head shape using a hot forging die. Because the hot forging die is in direct contact with the hot bolt blank during the process, its temperature rises. Therefore, coolant needs to be sprayed onto the die during machining to lower its temperature. However, the traditional method involves spraying coolant directly onto the die through a nozzle, resulting in significant coolant waste; only a small portion actually contacts the die, thus reducing coolant efficiency. Utility Model Content

[0005] In view of this, embodiments of this application provide a bolt cap press-fitting machine to solve the problem of coolant waste during spraying in related technologies.

[0006] To achieve the above objectives, the embodiments of this application provide the following technical solutions:

[0007] A bolt head press-fitting machine, comprising:

[0008] The base has a top plate installed at each of its four corners via four pillars;

[0009] A thermal base is fixedly installed on the upper surface of a base, comprising an inner base and an outer base; a return fluid cavity is formed between the inner base and the outer base, and the two are connected by an annular plate, the annular plate having a plurality of return fluid holes circumferentially distributed along the thickness direction and communicating with the return fluid cavity; a hexagonal groove is formed by a downward-facing recess on the top surface of the inner base, and a cooling cavity is formed around the area near the hexagonal groove inside the inner base; the top surface of the inner base is also provided with a plurality of overflow holes communicating with the cooling cavity, the plurality of overflow holes being evenly distributed around the hexagonal groove;

[0010] The housing contains oil coolant located beside the base. It passes through the inner wall of the outer base and communicates with the bottom of the cooling chamber via an inlet pipe. It also communicates with the bottom of the return chamber via a return pipe.

[0011] A hydraulic cylinder is vertically disposed at the bottom of the top plate, and a pressure plate is fixedly disposed at the end of its piston rod. The pressure plate is coaxially opposite to the hexagonal groove and is used to hot press the blank in the hexagonal groove.

[0012] In some possible implementations, the top of the outer wall of the outer base extends upward to form a baffle, which together with the annular plate and the inner base forms a liquid storage tank, which is used to receive the coolant flowing out of the overflow hole.

[0013] In some possible implementations, the pressing cake is a circular structure with an outer diameter larger than the outer diameter of the inner base.

[0014] In some possible implementations, each of the overflow holes has a chamfered outer perimeter at the top opening to guide the coolant to flow out smoothly.

[0015] In some possible implementations, multiple load-bearing columns are provided between the bottom of the hexagonal groove and the inner base, the load-bearing columns being used to distribute the pressure applied by the pressing plate.

[0016] In some possible implementations, a micro water pump, which is a corrosion-resistant micro gear pump, is connected in series on the inlet pipe.

[0017] The bolt head press-fitting machine provided in this application has at least the following beneficial effects:

[0018] In the bolt head press-fitting machine provided in this application embodiment, a cooling chamber is provided around the hexagonal groove of the inner base, and overflow holes are also provided on the top surface of the inner base along the hexagonal groove. A return liquid chamber is formed at the bottom of the inner base and the outer base, and a return liquid hole communicating with the return liquid chamber is provided along the thickness direction of the connecting plate between the two. Furthermore, the housing is connected to the cooling chamber and the return liquid chamber respectively through an inlet pipe. Thus, through the closed circulation system of the inlet pipe, cooling chamber, overflow hole, storage tank, return liquid hole, return liquid chamber, return liquid, and housing, it is ensured that the coolant uniformly covers the hexagonal groove area of ​​the hot-bending mold, and the hot-bending mold is cooled by the flowing coolant. The above structural design not only saves coolant usage but also improves the cooling effect on the hot-bending mold. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the bolt head press-fitting machine provided in the embodiments of this application;

[0021] Figure 2 for Figure 1 Assembly diagram of the thermal support base and the box body;

[0022] Figure 3 for Figure 1 Schematic diagram of the structure of the thermal support base;

[0023] Figure 4 for Figure 3 Side sectional view.

[0024] In the picture:

[0025] 100. Base; 110. Column; 120. Top plate;

[0026] 200. Inner base; 210. Hexagonal groove; 220. Cooling cavity; 230. Overflow hole; 240. Chamfered surface;

[0027] 300. Outer base; 310. Baffle; 320. Liquid storage tank;

[0028] 400. Return chamber;

[0029] 500, Annular plate; 510, Return hole;

[0030] 600. Box body; 610. Liquid inlet pipe; 620. Liquid return pipe;

[0031] 700. Hydraulic cylinder; 710. Pressing plate;

[0032] 800, load-bearing column. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0034] like Figures 1-4 As shown in the figure, the bolt head pressing machine provided in this application embodiment includes a base 100, a hot-pressing base, a housing 600, and a hydraulic patter 710. The base 100 is the main load-bearing structure of the pressing machine. The base 100 is welded from 235 steel plate, and columns 110 are fixedly welded to its four corners. A top plate 120 is bolted to the top of the columns 110, ensuring that the top plate 120 is parallel to the base 100. A vertically extending hydraulic cylinder 700 is mounted on the bottom of the top plate 120 via a flange. The piston rod of the hydraulic cylinder 700 is located above the base 100, and a pressing patter 710 is bolted to the end of the piston rod. The pressing patter 710 moves vertically under the drive of the hydraulic cylinder 700, and performs the function of hot-pressing and forming.

[0035] A hot-mounted base is fixedly installed on the upper surface of the base 100. The hot-mounted base consists of an inner base 200 and an outer base 300, both of which can be made of H13 hot work die steel. The inner base 200 is located inside the outer base 300, and the coaxial error between them is less than or equal to 0.05 mm. A return fluid cavity 400 is formed between the bottom of the inner base 200 and the bottom of the outer base 300. The sidewalls of the two are connected by a welded annular plate 500. The annular plate 500 has multiple return fluid holes 510 communicating with the return fluid cavity 400 along its thickness direction. The multiple return fluid holes 510 are equidistantly distributed on the annular plate 500 in the circumferential direction. Preferably, the outer periphery of the top opening of each overflow hole 230 is provided with a chamfered surface 240 to guide the coolant to flow out smoothly.

[0036] In this embodiment, a hexagonal groove 210 is formed by a downward indentation in the central area of ​​the top surface of the inner base 200. This hexagonal groove 210 is used to hold the bolt blank to be processed. Under the combined action of the hydraulic cylinder 700 and the pressure plate 710, a hexagonal nut can be formed at the end of the bolt blank. A cooling cavity 220 is formed inside the inner base 200 near the hexagonal groove 210. The cooling cavity 220 is opened around the hexagonal groove 210, and the shape of the cooling cavity 220 is adapted to the shape of the hexagonal groove 210. Figure 3 and Figure 4 As shown, the top surface of the inner base 200 is provided with a plurality of overflow holes 230 around the hexagonal groove 210, and the overflow holes 230 are connected to the cooling cavity 220. Preferably, the pressing cake 710 has a circular structure and its outer diameter is larger than the outer diameter of the inner base 200.

[0037] A housing 600 containing coolant is located beside the base 100. The housing 600 is connected to the cooling chamber 220 of the inner base 200 via an inlet pipe 610 that penetrates the side wall of the outer base 300. The housing 600 is also connected to the bottom of the return chamber 400 of the inner base 200 via a return pipe 620. A miniature water pump is installed at the inlet pipe 610, connected in series in the middle of the inlet pipe. In actual use, the miniature water pump pumps the coolant from the housing 600 into the cooling chamber 220 through the inlet pipe 610, cooling the side wall of the hexagonal groove 210 through heat conduction.

[0038] The following is combined Figures 1-4 The working principle and usage of the bolt head press-fitting machine provided in the embodiments of this application are described.

[0039] The pre-micro pump pumps the coolant from the housing 600 into the cooling chamber 220 of the inner base 200. The coolant flows around the cooling chamber 220 and absorbs heat from the sidewalls of the hexagonal groove 210 through heat conduction. The cooled coolant flows out through the overflow hole 230, falls onto the return plate, and re-enters the return chamber 400 through the return hole 510. Finally, the coolant in the return chamber 400 enters the housing 600 through the return pipe 620, thus achieving a continuous cooling flow loop by circulating the coolant within the cooling chamber 220 of the inner base 200.

[0040] The heated bolt blank is placed into the hexagonal groove 210 at the top of the inner base 200. The hydraulic cylinder 700 is controlled to move downwards, and the head of the bolt blank is hot-pressed by the pressure plate 710. After hot pressing, the end of the bolt blank forms a hexagonal cap, which heats up when it contacts the side wall of the hexagonal groove 210. The circulating coolant cools the side wall of the hexagonal groove 210, and the coolant can also be automatically recycled back into the housing 600. Preferably, a filter device is provided in the housing 600 to separate waste debris mixed in with the coolant to prevent it from affecting the normal circulation of the coolant.

[0041] In the bolt head press-fitting machine provided in this application embodiment, a cooling chamber 220 is provided around the hexagonal groove 210 of the inner base 200, and an overflow hole 230 is provided on the top surface of the inner base 200 along the hexagonal groove 210. A return liquid chamber 400 is formed at the bottom of the inner base 200 and the outer base 300, and a return liquid hole 510 communicating with the return liquid chamber 400 is provided along the thickness direction of the connecting plate between the two. Furthermore, the housing 600 is also connected to the cooling chamber 220 and the return liquid chamber 400 respectively through an inlet pipe 610. Thus, through the closed circulation system of the inlet pipe 610, cooling chamber 220, overflow hole 230, storage tank 320, return liquid hole 510, return liquid chamber 400, return liquid, and housing 600, it can be ensured that the coolant evenly coats the hexagonal groove 210 area of ​​the hot-bending mold, and the hot-bending mold is cooled by the flowing coolant. The above structural design not only saves on the use of coolant, but also improves the cooling effect on hot forming molds.

[0042] In some embodiments, a baffle 310 extends upward from the top of the outer wall of the outer base 300. The baffle 310, together with the annular plate 500 and the inner base 200, forms a liquid storage tank 320, which is used to receive the coolant flowing out of the overflow hole 230.

[0043] In some embodiments, multiple load-bearing columns 800 are provided between the bottom of the hexagonal groove 210 and the inner base 200. The load-bearing columns 800 are used to distribute the pressure applied by the pressing plate 710. During hot pressing, the pressure applied by the pressing plate 710 to the bolt blank is transmitted through the bolt blank to the bottom of the hexagonal groove 210. The load-bearing columns 800 can evenly distribute this pressure to the bottom of the inner base 200, avoiding depressions or deformations at the bottom of the hexagonal groove 210 due to excessive local stress, thereby significantly extending the service life of the inner base 200.

[0044] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0045] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," "some embodiments," etc., mentioned in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0046] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0047] It should be readily understood that the terms “on,” “above,” and “on top of” in this disclosure should be interpreted in the broadest possible sense, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on top of something” but also “on top of something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0048] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90 degrees or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0049] As used herein, the term "substrate" refers to the material on which subsequent material layers are added. The substrate itself may be patterned. The material added on top of the substrate may be patterned or may remain unpatterned. Furthermore, the substrate may include a wide range of materials, such as silicon, germanium, gallium arsenide, indium phosphide, etc. Alternatively, the substrate may be made of a non-conductive material (e.g., glass, plastic, or sapphire wafers).

[0050] The term "layer" as used herein can refer to a portion of material comprising a region of thickness. A layer may extend over the entire underlying or overlying structure, or may have a extent smaller than that of the underlying or overlying structure. Furthermore, a layer may be a region of a homogeneous or non-homogeneous continuous structure, with a thickness less than that of the continuous structure. For example, a layer may be located between the top and bottom surfaces of the continuous structure, or between any pairs of lateral planes at the top and bottom surfaces. A layer may extend laterally, vertically, and / or along a tapered surface. A substrate may be a layer, and may include one or more layers, and / or may have one or more layers located on, above, and / or below it. A layer may include multiple layers. For example, an interconnect layer may include one or more conductor and contact layers (forming contacts, interconnects, and / or vias therein) and one or more dielectric layers.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A bolt head press-fitting machine, characterized in that, include: The base has a top plate installed at each of its four corners via four pillars; A thermal base, which is fixedly installed on the upper surface of a base, includes an inner base and an outer base; A return fluid cavity is formed between the inner base and the outer base, and the two are connected by an annular plate. The annular plate has a plurality of return fluid holes that communicate with the return fluid cavity circumferentially distributed along the thickness direction. The top surface of the inner base is recessed downward to form a hexagonal groove, and a cooling cavity is formed around the area near the hexagonal groove inside the groove. The top surface of the inner base is also provided with a plurality of overflow holes that communicate with the cooling cavity, and the plurality of overflow holes are evenly distributed around the hexagonal groove. The housing contains oil coolant located beside the base. It passes through the inner wall of the outer base and communicates with the bottom of the cooling chamber via an inlet pipe. It also communicates with the bottom of the return chamber via a return pipe. A hydraulic cylinder is vertically disposed at the bottom of the top plate, and a pressure plate is fixedly disposed at the end of its piston rod. The pressure plate is coaxially opposite to the hexagonal groove and is used to hot press the blank in the hexagonal groove.

2. The bolt head press-fitting machine according to claim 1, characterized in that: The outer wall of the outer base extends upward to form a baffle. The baffle, together with the annular plate and the inner base, forms a liquid storage tank. The liquid storage tank is used to receive the coolant flowing out of the overflow hole.

3. The bolt head press-fitting machine according to claim 1, characterized in that: The pressed cake has a circular structure, and its outer diameter is larger than the outer diameter of the inner base.

4. The bolt head press-fitting machine according to claim 1, characterized in that: Each of the overflow holes has a chamfered surface around its top opening to guide the coolant to flow out smoothly.

5. The bolt head press-fitting machine according to claim 1, characterized in that: Multiple load-bearing columns are provided between the bottom of the hexagonal groove and the inner base, and the load-bearing columns are used to distribute the pressure applied by the pressing plate.

6. The bolt head press-fitting machine according to claim 1, characterized in that: A micro water pump, which is a corrosion-resistant micro gear pump, is installed in series on the liquid inlet pipe.

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