Complete equipment for machining sealing bolt

Abstract

The utility model relates to the field of bolt processing, and discloses complete equipment for processing a sealing bolt, which comprises a multi-station bolt forming machine, a lathe, a grinding machine, a heat treatment mesh belt furnace, an electroplating bath, a thread rolling machine, a high-temperature degreasing tank and a sealing tank which are sequentially arranged, wherein the multi-station bolt forming machine is provided with a cold heading forming die which is used for heading a bolt into a semi-finished product; the lathe is used for turning the head diameter of the bolt to ensure the head diameter and R angle tolerance; the grinding machine is used for grinding the bolt rod part to ensure the roughness of the surface of the rod part; the heat treatment mesh belt furnace is used for heat treatment; the electroplating bath is used for electroplating zinc-nickel surface treatment; the thread rolling machine is used for machining threads; the high-temperature degreasing tank is used for degreasing; and the sealing groove is used for sealing treatment. The bolt is directly subjected to cold heading to form a semi-finished product by using the cold heading forming die, so that most of form and location tolerance and dimensional tolerance of the semi-finished product are ensured, and most of machining cost is saved; and thread rolling is carried out after heat treatment and zinc-nickel electroplating, so that the precision of threads is effectively guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of bolt processing, in particular to a complete set of equipment for processing sealed bolts. Background Art

[0002] Sealed bolts, as high-strength connecting elements with excellent sealing performance, play an indispensable role in the mechanical field. It mainly consists of a bolt body, a washer and an intermediate cushion layer (in some cases, the washer can be omitted). Its design is usually compact and has high precision requirements, aiming to prevent liquid or gas from leaking between two connecting components. These characteristics make sealed bolts have irreplaceable advantages in special occasions. The application scope of sealed bolts is extensive, especially in high-pressure, high-temperature, low-temperature, reactive medium and flammable and explosive occasions, such as the petroleum, petrochemical, chemical, shipbuilding and other industries, where they play a crucial role. Compared with other types of bolts, the connection of sealed bolts is more dense, which can better prevent liquid or gas leakage. At the same time, sealed bolts usually require more complex designs in terms of structure to ensure the sealing effect, and precise processing and manufacturing are needed.

[0003] The main processing difficulty of sealed bolts lies in how to ensure their sealing performance. To ensure the sealing performance, the requirements for the thread accuracy, surface defects, geometric tolerance, roughness, etc. of the bolts are very high. At the same time, due to the cleanliness requirements in the application scenarios of sealed bolts, the cleanliness requirements for sealed bolts are also relatively high.

[0004] At present, the processing technology of sealed bolts is usually: cold heading - machining - thread rolling - heat treatment - surface treatment - inspection - packaging. In the existing cold heading processing and forming technology, only the preliminary shape of the workpiece is cold headed, and the semi-finished product is completely machined by turning, which will lead to a relatively large workload in the machining process, increase costs, and this process flow cannot effectively ensure the thread accuracy and geometric tolerance, nor can it prevent bumps during product production. Therefore, not only the cost is relatively high, but the processing accuracy is also unstable, the rejection rate is often relatively high, the production cost remains high, and at the same time, it also increases the work intensity of production and inspection personnel, bringing troubles.

[0005] Based on this, the present application provides a complete set of equipment for processing sealed bolts that can reduce the machining workload, has good product consistency, improves production efficiency while reducing the rejection rate, and also reduces the production cost. Summary of the Utility Model

[0006] The utility model aims to solve the technical problems existing in the prior art. For this purpose, the utility model provides a complete set of equipment for processing sealed bolts that can reduce the machining workload, has good product consistency, improves production efficiency while reducing the rejection rate, and also reduces the production cost.

[0007] The technical solution adopted by the present utility model to solve its technical problems is as follows:

[0008] A complete set of equipment for processing sealed bolts is provided, including a multi-station bolt forming machine, a lathe, a grinding machine, a heat treatment mesh belt furnace, an electroplating tank, a thread rolling machine, a high-temperature degreasing tank, and a sealing tank arranged in sequence. Among them: The multi-station bolt forming machine is equipped with a cold heading forming die for heading the bolt into a semi-finished product; the lathe is used to turn the diameter of the bolt head to ensure the head diameter and R angle tolerance and avoid the excessive R angle of cold heading affecting the airtightness; the grinding machine is used for grinding the bolt rod to ensure the surface roughness of the rod; the heat treatment mesh belt furnace is used for heat-treating the semi-finished product to ensure the product performance; the electroplating tank is used for electro-galvanizing nickel surface treatment of the semi-finished product to ensure the anti-corrosion property of the product; the thread rolling machine is used to process the required threads; the high-temperature degreasing tank is used for cleaning the workpiece to remove the surface oil; the sealing tank is used for sealing treatment of the workpiece to stabilize the friction coefficient and improve the anti-corrosion performance.

[0009] In a preferred embodiment of the present utility model, the cold heading forming die includes five groups of male dies and five groups of female dies, namely the first, second, third, fourth, and fifth station male dies and the first, second, third, fourth, and fifth station female dies corresponding to the first, second, third, fourth, and fifth station male dies; the five groups of male dies and female dies are respectively installed on the multi-station bolt forming machine, and the blank is moved between the five groups of male dies and female dies through the blank clamping system of the forming machine, and the blank is successively subjected to pre-shrinking the rod, shrinking the rod to produce a small rod, forming the small rod with a reduced angle, pre-forming the head and forming the stepped rod by shrinking the rod, and finally forming the head and reducing the angle of the rod.

[0010] In a preferred embodiment of the present utility model, the first station male die includes a first-stage initial punching die, a first-stage male die ejector rod, and a first-stage spacer block. Among them: The first-stage initial punching die is installed on the forming machine; one end of the first-stage male die ejector rod is fixed inside the first-stage initial punching die, and the other end exposes the first-stage initial punching die for extruding the blank; the first-stage spacer block is arranged inside the first-stage initial punching die for padding the first-stage male die ejector rod;

[0011] The first station female die includes a first-stage closed rod shrinking die and a first-stage female die ejector rod; the first-stage closed rod shrinking die is installed on the forming machine opposite to the first-stage initial punching die, and a cavity for pre-shrinking the blank is arranged inside it; one end of the first-stage female die ejector rod is arranged inside the first-stage closed rod shrinking die for limiting the blank and also for ejecting the pre-shrunk rod member.

[0012] In a preferred embodiment of the present utility model, the second station male die includes a second-stage initial punching die, a second-stage male die ejector rod, and a second-stage spacer block. Among them: The second-stage initial punching die is installed on the forming machine; one end of the second-stage male die ejector rod is fixed inside the second-stage initial punching die, and the other end exposes the second-stage initial punching die for extruding the blank; the second-stage spacer block is arranged inside the second-stage initial punching die for padding the second-stage male die ejector rod;

[0013] The second-station female mold includes a second-order closed rod shrinking mold and a second-order female mold push rod; the second-order closed rod shrinking mold is installed on the molding machine relative to the second-order primary punching mold, and is provided with a cavity for shrinking the blank to produce a small rod; one end of the second-order female mold push rod is arranged in the second-order closed rod shrinking mold, which is used to limit the blank and also to push out the workpiece.

[0014] In a preferred embodiment of the utility model, the third station male mold comprises a three-sequence primary punching die, a three-sequence male mold ejector rod and a three-sequence cushion block, wherein: the three-sequence primary punching die is installed on the molding machine; one end of the three-sequence male mold ejector rod is fixed in the three-sequence primary punching die, and the other end is exposed from the three-sequence primary punching die for extruding the blank; the three-sequence cushion block is arranged in the three-sequence primary punching die for cushioning the three-sequence male mold ejector rod;

[0015] The third-station female mold includes a three-sequence female mold sleeve, a three-sequence straight-through mold, a three-sequence angle reduction mold, a three-sequence female mold locking sleeve and a three-sequence female mold push rod, wherein: the three-sequence female mold sleeve is installed on the forming machine relative to the three-sequence primary punching mold; the three-sequence straight-through mold is arranged in the three-sequence female mold sleeve, and a cavity for constraining the rod part of the blank is provided therein; the three-sequence angle reduction mold is arranged in the three-sequence female mold sleeve and is located behind the three-sequence straight-through mold, and a angle reduction cavity for angle reduction molding of the small rod part of the blank is provided therein; the three-sequence female mold locking sleeve is screwed to the tail of the three-sequence female mold sleeve for locking the three-sequence angle reduction mold; the three-sequence female mold push rod is arranged in the three-sequence angle reduction mold for limiting the blank and also for pushing out the workpiece.

[0016] In a preferred embodiment of the utility model, the fourth station male mold includes a four-sequence fine stamping die, a four-sequence male mold ejector and a four-sequence spring seat, wherein: the four-sequence fine stamping die is installed on the molding machine, and its inner end surface is provided with a fine stamping die core, and the fine stamping die core is provided with a cavity for the head shape of the preform blank; the four-sequence male mold ejector is movably arranged in the four-sequence fine stamping die for pushing out the workpiece; the four-sequence spring seat is arranged in the four-sequence fine stamping die for supporting the four-sequence male mold ejector and providing restoring force for the four-sequence male mold ejector;

[0017] The fourth station female mold includes a four-sequence female mold sleeve, a four-sequence rod reduction mold, a four-sequence angle reduction mold, a four-sequence female mold locking sleeve and a four-sequence female mold push rod; the four-sequence female mold sleeve is installed on the forming machine relative to the four-sequence male mold push rod; the four-sequence rod reduction mold is arranged in the four-sequence female mold sleeve, which is provided with a cavity for pre-forming the head of the blank and shrinking the rod part to produce a step; the four-sequence angle reduction mold is arranged in the four-sequence female mold sleeve and is located behind the four-sequence rod reduction mold, and is provided with a cavity for shrinking the end face of the small rod part of the blank; the four-sequence female mold locking sleeve is screwed to the tail of the four-sequence female mold sleeve for locking the four-sequence angle reduction mold; the four-sequence female mold push rod is arranged in the four-sequence angle reduction mold for limiting the blank and also for pushing out the workpiece.

[0018] In a preferred embodiment of the present utility model, the male die of the fifth working station includes a five-step punching die, a five-step six-flower ejector rod, and a five-step spacer block, where: the five-step punching die is installed on a forming machine and is used to extrude the head of a blank; one end of the five-step six-flower ejector rod is fixed inside the five-step punching die, and the other end exposes the five-step punching die, and is used to form an internal hexagonal hole in the head of the workpiece; the five-step spacer block is arranged inside the five-step punching die and is used to pad the five-step six-flower ejector rod;

[0019] The female die of the fifth working station includes a five-step female die sleeve, a five-step trimming die, a five-step necking die, a five-step female die locking sleeve, and a five-step female die ejector rod, where: the five-step female die sleeve is installed on the forming machine opposite to the five-step punching die; the five-step trimming die is arranged inside the five-step female die sleeve, and is internally provided with a forming cavity for forming the head of the workpiece; the five-step necking die is arranged inside the five-step female die sleeve behind the five-step trimming die, and it has a forming cavity for constraining the rod part of the workpiece; the five-step necking die is arranged inside the five-step female die sleeve behind the five-step trimming die, and is internally provided with a necking cavity for necking the rod part of the workpiece; the five-step female die locking sleeve is screwed to the tail of the five-step female die sleeve and is used to lock the four-step necking die; the five-step female die ejector rod is arranged inside the five-step necking die and is used to position the blank and also to eject the workpiece.

[0020] In a preferred embodiment of the present utility model, the heat treatment mesh belt furnace is provided with anti-collision devices at both the inlet blanking section and the quenching oil tank section.

[0021] In a preferred embodiment of the present utility model, the anti-collision device includes multiple groups of elastic baffles fixedly installed on the mesh belt furnace above the mesh belt. The multiple groups of elastic baffles are arranged along the inclined direction of the mesh belt, and each group of elastic baffles is composed of 2 elastic baffles arranged in a "Z" shape.

[0022] In a preferred embodiment of the present utility model, the elastic baffle includes a baffle body, a torsion spring, a pin shaft, and a sleeve. The sleeve is fixed on the mesh belt furnace, the baffle body is rotatably installed on the sleeve through the pin shaft, and the torsion spring provides a restoring force for the baffle. The anti-collision device effectively avoids the collision caused by too large a height drop in the mesh belt transportation during heat treatment, and avoids the defects caused by surface collision damage affecting the sealing performance or thread accuracy.

[0023] Compared with the prior art, the beneficial effects of the present utility model are:

[0024] 1. The present utility model directly cold-forges bolts into semi-finished products by using a cold heading forming die, so that the semi-finished products ensure most of the geometric tolerances and dimensional tolerances, saving a large part of the machining cost, and at the same time, the product has good consistency;

[0025] 2. The bolts are thread-rolled after heat treatment and electro-galvanized nickel, effectively ensuring the thread accuracy. At the same time, cleaning and sealing after thread-rolling also improve the cleanliness of the products;

[0026] 3. The anti-collision device set in the heat treatment mesh belt furnace avoids the collision caused by too large a height drop in the mesh belt transportation during heat treatment, and avoids the defects caused by surface collision damage affecting the sealing performance or thread accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings, where:

[0028] Figure 1 is a schematic structural diagram of the sealing bolt provided by the present invention;

[0029] Figure 2 is a block diagram of the complete set of equipment for processing the sealing bolt provided by the present invention;

[0030] Figure 3 is a closed die state diagram of the cold heading forming die provided by the present invention at the first station;

[0031] Figure 4 is a forming diagram of the workpiece provided by the present invention at the first station;

[0032] Figure 5 is a closed die state diagram of the cold heading forming die provided by the present invention at the second station;

[0033] Figure 6 is a forming diagram of the workpiece provided by the present invention at the second station;

[0034] Figure 7 is a closed die state diagram of the cold heading forming die provided by the present invention at the third station;

[0035] Figure 8 is a forming diagram of the workpiece provided by the present invention at the third station;

[0036] Figure 9 is a closed die state diagram of the cold heading forming die provided by the present invention at the fourth station;

[0037] Figure 10 is a forming diagram of the workpiece provided by the present invention at the fourth station;

[0038] Figure 11 is a closed die state diagram of the cold heading forming die provided by the present invention at the fifth station;

[0039] Figure 12 is a forming diagram of the workpiece provided by the present invention at the fifth station;

[0040] Figure 13 is Figure 12 the provided left view;

[0041] Figure 14 is the front installation schematic diagram of the anti-collision device provided by the present utility model;

[0042] Figure 15 is Figure 14 the structural schematic diagram of the elastic baffle provided;

[0043] In the attached drawings, the list of components represented by each reference numeral is as follows:

[0044] 1A - the first-station male die, 1A.1 - the first-step initial punching die, 1A.2 - the first-station male die ejector rod, 1A.3 - the first-step spacer, 2A - the second-station male die, 2A.1 - the second-step initial punching die, 2A.2 - the second-station male die ejector rod, 2A.3 - the second-step spacer, 2B - the second-station female die, 2B.1 - the second-step closed necking die, 2B.2 - the second-station female die ejector rod, 3A - the third-station male die, 3A.1 - the third-step initial punching die, 3A.2 - the third-station male die ejector rod, 3A.3 - the third-step spacer, 3B - the third-station female die, 3B.1 - the third-step female die sleeve, 3B.2 - the third-step straight-through die, 3B.3 - the third-step corner shrinking die, 3B.4 - the third-step female die locking sleeve, 3B.5 - the third-station female die ejector rod, 4A - the fourth-station male die, 4A.1 - the fourth-step fine blanking die, 4A.2 - the fourth-station male die ejector rod, 4A.3 - the fourth-step spring seat, 4B - the fourth-station female die, 4B.1 - the fourth-step female die sleeve, 4B.2 - the fourth-step necking die, 4B.3 - the fourth-step corner shrinking die, 4B.4 - the fourth-step female die locking sleeve, 4B.5 - the fourth-station female die ejector rod, 5A - the fifth-station male die, 5A.1 - the fifth-step punching die, 5A.2 - the fifth-step six-flower ejector rod, 5A.3 - the fifth-step spacer, 5B - the fifth-station female die, 5B.1 - the fifth-step female die sleeve, 5B.2 - the fifth-step trimming die, 5B.3 - the fifth-step corner shrinking die, 5B.4 - the fifth-step female die locking sleeve, 5B.5 - the fifth-station female die ejector rod, 10 - the elastic baffle, 10.1 - the baffle body, 10.2 - the torsion spring, 10.3 - the pin shaft, 10.4 - the sleeve. Detailed implementation manners

[0045] It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0046] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0047] 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 element 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;

[0048] In addition, the descriptions of the terms "first", "second", etc. in the present utility model are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. The terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. 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 circumstances.

[0049] In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0050] Embodiment 1

[0051] This embodiment provides a complete set of equipment for processing sealed bolts, which is used to process the sealed bolts as shown in the attached Figure 1 figure. As shown in the attached Figure 2 figure, the complete set of equipment includes a multi-station bolt forming machine, a lathe, a grinding machine, a heat treatment mesh belt furnace, an electroplating tank, a thread rolling machine, a high-temperature degreasing tank, and a sealing tank arranged in sequence, wherein: The multi-station bolt forming machine is equipped with a cold heading forming die for heading the bolt into a semi-finished product; the lathe is used to turn the diameter of the bolt head to ensure the head diameter and R-angle tolerance, and avoid the excessive R-angle of cold heading affecting the airtightness; the grinding machine is used for grinding the bolt rod to ensure the surface roughness of the rod; the heat treatment mesh belt furnace is used for heat-treating the semi-finished product to ensure the product performance; the electroplating tank is used for electro-galvanizing nickel surface treatment of the semi-finished product to ensure the anti-corrosion property of the product; the thread rolling machine is used to process the required threads; the high-temperature degreasing tank is used for cleaning the workpiece to remove the surface oil; the sealing tank is used for sealing treatment of the workpiece to stabilize the friction coefficient and improve the anti-corrosion performance. After the product processing is completed, quality inspection and packaging are carried out.

[0052] The cold heading forming die includes five groups of male dies and five groups of female dies, namely the male dies of the first, second, third, fourth, and fifth stations and the female dies of the first, second, third, fourth, and fifth stations corresponding to the male dies of the first, second, third, fourth, and fifth stations; the five groups of male dies and female dies are respectively installed on a multi-station bolt forming machine, and the blank is moved between the five groups of female dies and male dies through the blank clamping system of the forming machine, and the blank is successively subjected to pre-shrinking the rod, shrinking the rod to form a small rod, forming the corner of the small rod, pre-forming the head, forming the step of the rod part by shrinking the rod, and finally forming the head and shrinking the corner of the rod part.

[0053] As shown in the Figure 4 accompanying figure, the male die 1A of the first station includes the first-order initial punching die 1A.1, the first-order male die ejector rod 1A.2, and the first-order spacer block 1A.3, where: the first-order initial punching die is installed on the forming machine; one end of the first-order male die ejector rod is fixed inside the first-order initial punching die, and the other end exposes the first-order initial punching die for extruding the blank; the first-order spacer block is arranged inside the first-order initial punching die for padding the first-order male die ejector rod.

[0054] As shown in the Figure 4 accompanying figure, the female die 1B of the first station includes the first-order closed rod shrinking die 1B.1 and the first-order female die ejector rod 1B.2; the first-order closed rod shrinking die is installed on the forming machine opposite to the first-order initial punching die, and a cavity for pre-shrinking the blank is arranged inside it; one end of the first-order female die ejector rod is arranged inside the first-order closed rod shrinking die for limiting the blank and also for pushing out the pre-shrunk rod part.

[0055] During the pre-shrinking of the rod at the first station, the blank clamping system of the forming machine sends the blank to the die orifice of the female die of the first station. When the main slider of the forming machine moves towards the female die of the first station, the blank is pushed into the first-order closed rod shrinking die under the action of the male die of the first station. The main slider continues to move forward to the frontmost point, and the material is compressed and deformed. The first-order male die ejector rod, the first-order closed rod shrinking die, and the first-order female die ejector rod jointly complete the shrinking of the rod part of the blank. The pre-formed part is as shown in the Figure 4 accompanying figure.

[0056] As shown in the Figure 5 accompanying figure, the male die 2A of the second station includes the second-order initial punching die 2A.1, the second-order male die ejector rod 2A.2, and the second-order spacer block 2A.3, where: the second-order initial punching die is installed on the forming machine; one end of the second-order male die ejector rod is fixed inside the second-order initial punching die, and the other end exposes the second-order initial punching die for extruding the blank; the second-order spacer block is arranged inside the second-order initial punching die for padding the second-order male die ejector rod.

[0057] As shown in the Figure 5As shown, the female die 2B at the second station includes a two-stage closed necking die 2B.1 and a two-stage female die ejector rod 2B.2; the two-stage closed necking die is installed on the forming machine relative to the two-stage initial punching die, and a cavity for necking the blank to produce a small rod is provided therein; one end of the two-stage female die ejector rod is arranged in the two-stage closed necking die, which is used to limit the blank and also to eject the workpiece.

[0058] When necking and producing a small rod at the second station, the blank clamping system of the forming machine sends the blank to the die orifice of the female die at the second station. When the main slider of the forming machine moves towards the female die at the second station, the blank is pushed into the two-stage closed necking die under the action of the male die at the second station. The main slider continues to move forward to the frontmost point, and the material is compressed and deformed. The two-stage male die ejector rod, the two-stage closed necking die, and the two-stage female die ejector rod jointly complete the necking of the blank to produce a small rod. The formed part is as shown in the appendix Figure 6 shown.

[0059] As shown in the appendix Figure 7 As shown, the male die 3A at the third station includes a three-stage initial punching die 3A.1, a three-stage male die ejector rod 3A.2, and a three-stage spacer block 3A.3, where: the three-stage initial punching die is installed on the forming machine; one end of the three-stage male die ejector rod is fixed in the three-stage initial punching die, and the other end exposes out of the three-stage initial punching die, which is used to extrude the blank; the three-stage spacer block is arranged in the three-stage initial punching die, which is used to pad the three-stage male die ejector rod.

[0060] As shown in the appendix Figure 7 As shown, the female die 3B at the third station includes a three-stage female die sleeve 3B.1, a three-stage straight-through die 3B.2, a three-stage angle-reducing die 3B.3, a three-stage female die locking sleeve 3B.4, and a three-stage female die ejector rod 3B.5, where: the three-stage female die sleeve is installed on the forming machine relative to the three-stage initial punching die; the three-stage straight-through die is arranged in the three-stage female die sleeve, and a cavity for restricting the rod part of the blank is provided therein; the three-stage angle-reducing die is arranged in the three-stage female die sleeve behind the three-stage straight-through die, and an angle-reducing cavity for forming the angle of the small rod part of the blank is provided therein; the three-stage female die locking sleeve is screwed to the tail of the three-stage female die sleeve, which is used to lock the three-stage angle-reducing die; the three-stage female die ejector rod is arranged in the three-stage angle-reducing die, which is used to limit the blank and also to eject the workpiece.

[0061] When forming the angle of the small rod at the third station, the blank clamping system of the forming machine sends the blank to the die orifice of the female die at the third station. When the main slider of the forming machine moves towards the female die at the third station, the blank is pushed into the three-stage straight-through die under the action of the male die at the third station. The main slider continues to move forward to the frontmost point, and the material is compressed and deformed. The three-stage male die ejector rod, the three-stage straight-through die, the three-stage angle-reducing die, and the three-stage female die ejector rod jointly complete the angle-forming of the small rod of the blank. The formed part is as shown in the appendix Figure 8 shown.

[0062] As shown in the appendix Figure 9As shown, the male die 4A at the fourth station includes a four - sequence fine blanking die 4A.1, a four - sequence male die ejector rod 4A.2, and a four - sequence spring seat 4A.3, where: The four - sequence fine blanking die is installed on the forming machine, and its inner end face is provided with a fine blanking die core, and a cavity for pre - forming the head shape of the blank is provided inside the fine blanking die core; The four - sequence male die ejector rod is movably arranged inside the four - sequence fine blanking die and is used to eject the workpiece; The four - sequence spring seat is arranged inside the four - sequence fine blanking die and is used to hold the four - sequence male die ejector rod and provide a restoring force for the four - sequence male die ejector rod at the same time.

[0063] As shown in the appendix Figure 9 As shown, the female die 4B at the fourth station includes a four - sequence female die sleeve 4B.1, a four - sequence necking die 4B.2, a four - sequence corner - shrinking die 4B.3, a four - sequence female die locking sleeve 4B.4, and a four - sequence female die ejector rod 4B.5; The four - sequence female die sleeve is installed on the forming machine opposite to the four - sequence male die ejector rod; The four - sequence necking die is arranged inside the four - sequence female die sleeve, and a cavity for pre - forming the head of the blank and necking the rod part to form a step is provided inside it; The four - sequence corner - shrinking die is arranged behind the four - sequence necking die inside the four - sequence female die sleeve, and a cavity for corner - shrinking the end face of the small rod part of the blank is provided inside it; The four - sequence female die locking sleeve is screwed to the tail of the four - sequence female die sleeve and is used to lock the four - sequence corner - shrinking die; The four - sequence female die ejector rod is arranged inside the four - sequence corner - shrinking die and is used to position the blank and also to eject the workpiece.

[0064] When pre - forming the head and necking the rod part of the blank at the fourth station to form a step, the clamping system of the forming machine sends the blank to the die orifice of the female die at the fourth station. When the main slider of the forming machine moves towards the female die at the fourth station, the blank is pushed into the four - sequence necking die under the action of the male die at the fourth station. The main slider continues to move forward to the frontmost point, and the material is compressed and deformed. The four - sequence fine blanking die, four - sequence male die ejector rod, four - sequence necking die, four - sequence corner - shrinking die, and four - sequence female die ejector rod jointly complete the pre - forming of the head of the workpiece and the necking of the rod part to form a step. The formed part is as shown in the appendix Figure 10 shown.

[0065] As shown in the appendix Figure 11 As shown, the male die 5A at the fifth station includes a five - sequence punching die 5A.1, a five - sequence six - flower ejector rod 5A.2, and a five - sequence spacer block 5A.3, where: The five - sequence punching die is installed on the forming machine and is used to extrude the head of the blank; One end of the five - sequence six - flower ejector rod is fixed inside the five - sequence punching die, and the other end protrudes from the five - sequence punching die and is used to form the internal hexagonal hole of the workpiece head; The five - sequence spacer block is arranged inside the five - sequence punching die and is used to pad the five - sequence six - flower ejector rod.

[0066] As shown in the appendix Figure 11As shown, the female die 5B of the fifth station includes a five-sequence female die sleeve 5B.1, a five-sequence trimming die 5B.2, a five-sequence angle-reducing die 5B.3, a five-sequence female die locking sleeve 5B.4, and a five-sequence female die ejector rod 5B.5, where: The five-sequence female die sleeve is installed on the forming machine relative to the five-sequence punching die; The five-sequence trimming die is arranged inside the five-sequence female die sleeve, and is provided with a forming cavity for forming the head of the workpiece and restricting the rod part of the workpiece; The five-sequence angle-reducing die is arranged inside the five-sequence female die sleeve behind the five-sequence trimming die, and is provided with an angle-reducing cavity for reducing the angle of the rod part of the workpiece; The five-sequence female die locking sleeve is screwed to the tail of the five-sequence female die sleeve for locking the four-sequence angle-reducing die; The five-sequence female die ejector rod is arranged inside the five-sequence angle-reducing die for limiting the blank and also for ejecting the workpiece.

[0067] When the head of the workpiece is finally upset and the angle of the rod part is reduced at the fifth station, the blank is sent to the die orifice of the female die of the fifth station by the blank clamping system of the forming machine. When the main slider of the forming machine moves towards the female die of the fifth station, the blank is pushed into the five-sequence trimming die under the action of the male die of the fifth station. The main slider continues to move forward to the frontmost point, and the material is compressed and deformed. The five-sequence punching die, the five-sequence six-flower ejector rod, the five-sequence trimming die, the five-sequence angle-reducing die, and the five-sequence female die ejector rod jointly complete the final upsetting of the head of the workpiece and the angle reduction of the rod part of the workpiece. The formed part is as shown in the appendix Figure 10 shown.

[0068] In order to solve the problem of poor quality caused by surface bumps of workpieces in high-drop sections such as the inlet blanking section and the quenching oil tank section during the heat treatment process, which affect the sealing performance or thread accuracy, anti-collision devices are provided at the inlet blanking section and the quenching oil tank section of the heat treatment mesh belt furnace in this embodiment. As shown in the appendix Figure 14 shown, the anti-collision device includes multiple groups of elastic baffles fixedly installed above the mesh belt on the mesh belt furnace. The multiple groups of elastic baffles are arranged along the inclined direction of the mesh belt. Each group of elastic baffles consists of 2 elastic baffles 10 arranged in a "Z" shape. In this embodiment, the elastic baffles are used to buffer the workpieces to prevent surface bumps of the workpieces caused by high drops.

[0069] Specifically, as shown in the appendix Figure 15 shown, the elastic baffle 10 includes a baffle body 10.1, a torsion spring 10.2, a pin shaft 10.3, and a sleeve 10.4. The sleeve is fixed on the mesh belt furnace. The baffle body is rotatably installed on the sleeve through the pin shaft. The torsion spring provides a restoring force for the baffle. It is preferably to control the inclination degree of the baffle body within 60°. In this way, when the product falls on the baffle body, the force generated when the product falls can be effectively reduced. When necessary, a steel plate can be installed under the baffle body to prevent the baffle body from deforming due to the pressure of large workpieces. Since the elastic baffle is mainly used for the inlet and the section entering the oil tank, the working temperature is generally not higher than 200°C. The material of the baffle body can be made of high-temperature-resistant polyethylene board.

[0070] The above are only embodiments of the present utility model, and do not thus limit the patent scope of the present utility model. Any equivalent structure or equivalent process transformation made by using the content of the specification of the present utility model, or directly or indirectly applied in other related technical fields, shall similarly be included within the patent protection scope of the present utility model.

Claims

1. A complete set of equipment for processing sealing bolts, characterized in that: include: A multi-station bolt forming machine equipped with a cold forging die for forging bolts into semi-finished products; Lathe, used to turn the bolt head diameter to ensure the head diameter and R angle tolerance; Grinding machine, used for grinding the bolt shank to ensure the surface roughness of the shank; Heat treatment mesh belt furnace, used for heat treatment of semi-finished products; Electroplating tanks for electroplating zinc and nickel surface treatment of semi-finished products; Thread rolling machine, used to process the required threads; High temperature degreasing tank, used to clean workpieces and remove surface oil; The closed groove is used to seal the workpiece.

2. The sealing bolt processing equipment according to claim 1, characterized in that: The cold heading forming die comprises: Five sets of male molds, including the first, second, third, fourth and fifth station male molds; Five groups of female molds, including first, second, third, fourth and fifth station female molds corresponding to the first, second, third, fourth and fifth station male molds respectively; The five groups of male and female dies are respectively installed on the multi-station bolt forming machine. The blank is moved between the five groups of female dies through the material clamping system of the forming machine, and the blank is sequentially subjected to rod pre-shrinking, rod shrinking to produce small rods, small rod angle reduction forming, head pre-forming and rod bundle step forming, head final upsetting forming and rod angle reduction.

3. The sealing bolt processing equipment according to claim 2, characterized in that: The first station male mold comprises: A first-order initial punching die is installed on the forming machine; A first-order male die ejector pin, one end of which is fixed in a first-order primary die and the other end of which is exposed from the first-order primary die, is used for extruding the blank; A first-order cushion block is arranged in a first-order initial punching die and is used to cushion a first-order male die ejector rod; The first station female mold comprises: A first-order closed rod shrinking die is installed on the molding machine opposite to the first-order initial punching die, and a cavity for pre-shrinking the blank is provided therein; A first-order female mold ejector pin has one end arranged in a first-order closed shrink rod mold and is used for limiting the blank and also for pushing out the pre-shrink rod.

4. The sealing bolt processing equipment according to claim 2, characterized in that: The second station male mold comprises: The second-order primary punch die is installed on the forming machine; The second-order male die ejector pin has one end fixed in the second-order primary die and the other end exposed from the second-order primary die for extruding the blank; The second-order cushion block is arranged in the second-order primary punch die and is used to cushion the second-order male die ejector rod; The second station female mold comprises: The second-order closed rod shrinking die is installed on the forming machine relative to the second-order primary punching die, and is provided with a cavity for shrinking the blank into a small rod; The second-order female mold ejector pin has one end arranged in the second-order closed shrink rod mold and is used to limit the blank and also to push out the workpiece.

5. The sealing bolt processing equipment according to claim 2, characterized in that: The third station male mold comprises: The three-stage primary punch die is installed on the forming machine; A three-sequence male die ejector pin, one end of which is fixed in the three-sequence primary die and the other end of which is exposed from the three-sequence primary die, is used for extruding the blank; The three-sequence cushion block is arranged in the three-sequence primary punch die and is used to cushion the three-sequence male die ejector rod; The third station female mold comprises: The three-sequence female die set is installed on the forming machine relative to the three-sequence primary punch die; The three-sequence straight-through die is arranged in the three-sequence female die sleeve, and a cavity for constraining the rod part of the blank is arranged therein; The three-stage angle reduction die is arranged in the three-stage female die sleeve and is located behind the three-stage straight-through die. A angle reduction cavity is arranged therein for reducing the angle of the small rod of the blank; The three-sequence female mold locking sleeve is screwed to the tail of the three-sequence female mold sleeve and is used to lock the three-sequence shrink angle mold; The three-sequence female die ejector pin is arranged in the three-sequence reduction angle die and is used to limit the blank and also to push out the workpiece.

6. The sealing bolt processing equipment according to claim 2, characterized in that: The fourth station male mold comprises: A fourth-order fine-punching die is installed on the forming machine, and a fine-punching die core is provided on its inner end surface, wherein a cavity for the head of the preform blank is provided in the fine-punching die core; The four-sequence male die ejector rod is movably arranged in the four-sequence fine punching die and is used to push out the workpiece; The four-sequence spring seat is arranged in the four-sequence fine stamping die, and is used to support the four-sequence male die ejector rod and provide restoring force for the four-sequence male die ejector rod; The fourth station female mold comprises: The four-sequence female mold sleeve is installed on the molding machine relative to the four-sequence male mold ejector rod; The four-sequence rod shrinking mold is arranged in the four-sequence female mold sleeve, and is provided with a cavity for preforming the head of the blank and shrinking the rod to form a step; The four-sequence angle reduction die is arranged in the four-sequence female die sleeve and is located behind the four-sequence rod reduction die, and is provided with a cavity for reducing the angle of the end face of the small rod part of the blank; The four-sequence female mold locking sleeve is screwed to the tail of the four-sequence female mold sleeve and is used to lock the four-sequence shrinkage mold; The four-sequence female die ejector pin is located in the four-sequence reduction die and is used to limit the blank and also to push out the workpiece.

7. The sealing bolt processing equipment according to claim 2, characterized in that: The fifth station male mold comprises: The five-stage punch die is installed on the forming machine and is used to extrude the head of the blank; The five-sequence six-flower ejector pin has one end fixed in the five-sequence punch die and the other end exposed from the five-sequence punch die, and is used to form the hexagonal hole in the head of the workpiece; The five-sequence cushion block is arranged in the five-sequence punch die and is used to cushion the five-sequence six-flower ejector rod; The fifth station female mold comprises: The five-sequence female die set is installed on the molding machine relative to the five-sequence punching die; The five-sequence trimming die is arranged in the five-sequence female die sleeve and is provided with a forming cavity for forming the workpiece head and constraining the workpiece stem; The five-sequence shrinking cornea is arranged in the five-sequence female mold sleeve and is located behind the five-sequence trimming mold. A shrinking cavity for shrinking the workpiece rod is arranged therein; The five-sequence female mold locking sleeve is screwed to the tail of the five-sequence female mold sleeve and is used to lock the four-sequence shrinkage mold; The five-sequence female die ejector pin is arranged in the five-sequence angle reduction die and is used to limit the blank and also to push out the workpiece.

8. The sealing bolt processing equipment according to claim 1, characterized in that: The heat treatment mesh belt furnace is provided with anti-collision devices at the inlet unloading section and the quenching oil tank section.

9. The sealing bolt processing equipment according to claim 8, characterized in that: The anti-collision device includes multiple groups of elastic baffles fixedly installed on the mesh belt furnace and located above the mesh belt. The multiple groups of elastic baffles are arranged along the inclined direction of the mesh belt, and each group of elastic baffles consists of two elastic baffles arranged in a "Z" shape.

10. The sealing bolt processing equipment according to claim 9, characterized in that: The elastic baffle comprises a baffle body, a torsion spring, a pin and a sleeve. The sleeve is fixed on the mesh belt furnace, the baffle body is rotatably mounted on the sleeve through the pin, and the torsion spring provides restoring force for the baffle.

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