A projection welding tool and projection welding method for an eight-cylinder fuel rail injector seat

Abstract

The present invention relates to the field of automobile oil rail production and manufacturing, and in particular to a projection welding tool for an eight-cylinder oil rail injector seat, comprising an upper die consisting of an upper electrode and an upper die seat and a lower die consisting of a lower electrode and a lower die seat; the upper die seat and the lower die seat are connected by a guide column assembly; the upper electrode is fixed to the upper die seat by inserting or screwing; four split electrodes are arranged in the middle of the upper electrode; the split electrode is connected to a first cylinder and is driven by the first cylinder to move forward and backward; the first cylinder is screwed to a cylinder fixing plate connected to the upper die seat; the lower electrode is fixed to the lower die seat by inserting or screwing. The present invention also includes a projection welding method using the above-mentioned tool. The present invention achieves the technical difficulty of one-time projection welding of eight-cylinder oil rails by adding a split electrode driven by a cylinder to the upper electrode, saving development costs, and has a simple working process, convenient use, simple structure, high working efficiency, good process feasibility, and significant economic benefits.

Description

Technical Field

[0001] The invention relates to the field of automobile fuel rail production and manufacturing, and in particular to a projection welding tool and a projection welding method for an eight-cylinder fuel rail injector seat. Background Art

[0002] The fuel rail of an automobile consists of a welded fuel injector seat and a fuel distribution pipe. As the name implies, it is the fuel injection system of the automobile. It is used to store fuel and suppress pressure fluctuations caused by the fuel supply of the high-pressure pump and the fuel injection of the fuel injector, ensuring the stability of the system pressure. It occupies an important position in the structure of the entire vehicle. The fuel injector seat on the fuel rail plays the role of injecting fuel, so the projection welding connection process between it and the fuel distribution pipe is also a key process in the entire fuel rail manufacturing process.

[0003] Traditionally, projection welding of four-cylinder fuel rail injector seats is basically performed with one set of tooling, and the process and parameters have become mature after years of production verification. For projection welding of an eight-cylinder fuel rail, the current production process parameters cannot meet the projection welding quality, and it is difficult to guarantee the relative position of the injector seat of the part itself. Given the current industry situation, it is still difficult to projection weld eight injector seats at a time. Summary of the invention

[0004] The purpose of the present invention is to provide a projection welding tool and a projection welding method for an eight-cylinder fuel rail injector seat, which mainly solves the problems existing in the above-mentioned prior art. The present invention has a simple working process, is easy to use, has a simple structure, has high working efficiency, good process feasibility, and significant economic benefits.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is to provide an eight-cylinder fuel rail injector seat projection welding tool, which is characterized in that it includes an upper die composed of an upper electrode and an upper die base and a lower die composed of a lower electrode and a lower die base; the upper die base and the lower die base are connected by a guide column assembly; the upper electrode is fixed to the upper die base by inserting or screwing; four split electrodes are arranged in the middle of the upper electrode; the split electrode is connected to the first cylinder and is driven by the first cylinder to move forward and backward; the first cylinder is locked on the cylinder fixing plate connected to the upper die base by screws; the lower electrode is fixed to the lower die base by inserting or screwing.

[0006] Furthermore, the split electrode and the upper electrode are slidably matched with each other, and the upper electrode guides the forward and backward movement of the split electrode.

[0007] Furthermore, an injector positioning mechanism for determining the position and direction of the injector seat is also provided on the lower electrode; the injector seat positioning mechanism is insulated and connected to the lower electrode.

[0008] Furthermore, the injector seat positioning mechanism is composed of an injector seat positioning pin for calibrating the position and an injector seat direction anti-error plate for determining the direction; the outer diameter of the injector positioning pin is inlaid with a bakelite insulating sleeve, which is tightly matched with the lower electrode by knocking in; the injector seat direction anti-error plate is fixed to the lower electrode by screws and is located on both sides of the injector seat positioning pin; an insulating sheet is arranged between the injector seat direction anti-error plate and the lower electrode.

[0009] Furthermore, a distribution tube positioning mechanism for determining the position and direction of the distribution tube is also provided on the lower electrode; the distribution tube positioning mechanism is insulated and connected to the lower electrode.

[0010] Furthermore, the distribution pipe positioning mechanism is composed of a distribution pipe positioning block for calibrating the position and a distribution pipe direction anti-error block for determining the direction; the lower end of the distribution pipe positioning block is fixed to both sides of the lower electrode by screws, and a ball head plunger is installed on the upper end; an insulating sheet is arranged between the distribution pipe positioning block and the lower electrode; the distribution pipe direction anti-error block is fixed to one end of the lower electrode by screws, and an insulating sheet is arranged between the distribution pipe direction anti-error block and the lower electrode.

[0011] Furthermore, a product removing mechanism is provided inside the lower electrode.

[0012] Furthermore, the product unloading mechanism includes a movable ejector rod, a beating rod, a connecting rod, a movable pendulum block, a cylinder connector, a second cylinder and a connecting rod support. The movable ejector rod is clearance-matched with the lower electrode. One end of the beating rod is inserted into the inner groove of the movable ejector rod, and the other end is fixed by screws and a connecting rod. The connecting rod passes through the connecting rod support and is fixed by clearance fit; the connecting rod support is fixed to the lower die seat by inlaying and screwing; the inner hole at one end of the movable pendulum block passes through the connecting rod and is slidably matched with the connecting rod, and the other end is connected to the cylinder connector by a hinge pin; the cylinder connector is connected to the second cylinder by a thread; when the second cylinder is actuated, it drives the movable pendulum block, the connecting rod and the beating rod, and finally drives the movable ejector rod to be ejected from the injector seat positioning mechanism to complete the product unloading.

[0013] Furthermore, a travel control rod for controlling the downward distance of the upper die base is provided between the upper die base and the lower die base; the travel control rod is locked and fixed with the upper die base and the lower die base through threads.

[0014] The present invention also includes a method for projection welding using an eight-cylinder fuel rail injector seat projection welding tool, comprising the steps of:

[0015] Step S101, using the injector seat positioning mechanism, placing eight injector seats in the correct direction and at the correct position on the lower electrode;

[0016] Step S102, using the distribution pipe positioning mechanism to place the distribution pipe in a correct direction to a correct position on the lower electrode relative to the injector seat;

[0017] Step S103, pressing the double-hand switch, the projection welding machine drives the upper die seat to move downward, and uses the upper electrode to perform projection welding on the four injector seats on the distribution pipe; when the stroke reaches the bottom dead center, the equipment moves upward;

[0018] Step S104, when the upward movement is completed, the cylinder manual valve is pressed to control the first cylinder to drive the four split electrodes to move forward;

[0019] Step S105, pressing the double-hand switch, the projection welding machine drives the upper die seat to move downward, and uses the split electrode to perform projection welding on the other four injector seats on the distribution pipe; when the stroke reaches the bottom dead center, the equipment moves upward;

[0020] Step S106, the distribution pipe and the injector seat that have been welded together are removed from the distribution pipe positioning mechanism and the injector seat positioning mechanism respectively, thereby completing the material removal.

[0021] In view of the above technical features, the present invention has the following beneficial effects: the present invention solves the technical problem of one-time projection welding of eight-cylinder oil rails by adding a split electrode driven by a cylinder to the upper electrode, saving development costs. It has a simple working process, convenient use, simple structure, high working efficiency, good process feasibility and significant economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a front view of a preferred embodiment of the projection welding tooling for the eight-cylinder fuel rail injector seat of the present invention;

[0023] Figure 2 yes Figure 1 Side view of

[0024] Figure 3 It is a structural schematic diagram of the upper electrode in a preferred embodiment of the projection welding tooling for the eight-cylinder fuel rail injector seat of the present invention;

[0025] Figure 4 The present invention is a flow chart of a preferred embodiment of a projection welding method using an eight-cylinder fuel rail injector seat projection welding tool.

[0026] In the figure: 1-upper die base, 2-lower die base, 3-upper electrode, 4-split electrode 5-first cylinder, 6-cylinder fixing plate, 7-lower electrode, 8-injector seat locating pin, 9-injector seat direction error prevention plate, 10-distribution pipe locating block, 11-distribution pipe direction error prevention block, 12-movable ejector rod, 13-beating rod, 14-connecting rod, 15-movable swing block, 16-cylinder connecting head, 17-second cylinder, 18-connecting rod support, 19-stroke control rod, 20-guide column assembly. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0028] See also Figure 1 , Figure 2 and Figure 3 The present invention discloses a projection welding tool for an eight-cylinder fuel rail injector seat. As shown in the figure: a preferred embodiment thereof is composed of an upper die and a lower die. The upper electrode 3 and the upper die seat 1 constitute the upper die, and the lower electrode 7 and the lower die seat 2 constitute the lower die. The upper electrode 3 is fixed to the upper die seat 1 by inserting or screwing, and the lower electrode 7 is fixed to the lower die seat 2 by inserting or screwing. The upper die seat 1 and the lower die seat 2 are guided by a guide column assembly 20. Driven by the projection welding machine, the upper die seat 1 moves downward along the guide column assembly 20, and its projection welding stroke is controlled by the stroke control rod 19. The stroke control rod 19 is locked and fixed to the upper die seat 1 and the lower die seat 2 through a thread.

[0029] The upper electrode 3 on the upper die base 1 is a whole, and four split electrodes 4 are arranged in the middle of the whole upper electrode 3. The split electrodes 4 and the upper electrode 3 are slidably matched with each other. The four split electrodes 4 are all connected to the No. 1 cylinder 5, driven by the first cylinder 5, and move back and forth under the guidance of the upper electrode 3. The first cylinder 5 is screwed on the cylinder fixing plate 6, and the cylinder fixing plate 6 is connected to the upper die base 1.

[0030] The lower electrode 7 on the lower die base 2 is provided with an injector seat positioning mechanism and a distribution pipe positioning mechanism, which are used to ensure that the welded parts are in the correct position and direction before welding. The injector seat positioning mechanism and the distribution pipe positioning mechanism are both electrically insulated from the lower electrode 7.

[0031] The injector seat positioning mechanism is used to determine the position and direction of the injector seat before welding, and is composed of an injector seat positioning pin 8 for calibrating the position and an injector seat direction error prevention plate 9 for determining the direction. The injector seat positioning pin 8 is tightly matched with the lower electrode 7 by knocking in. A bakelite insulating sleeve is embedded in the outer diameter of the injector positioning pin 8 to form electrical insulation with the lower electrode 7. The injector seat direction error prevention plate 9 is fixed to the lower electrode 7 by screws, and an insulating sheet is installed between the two. The injector seat direction error prevention plate 9 is located on both sides of the injector seat positioning pin 8.

[0032] The distribution pipe positioning mechanism is used to determine the position and direction of the distribution pipe before welding, and is composed of a distribution pipe positioning block 10 for calibrating the position and a distribution pipe direction error prevention block 11 for determining the direction. The lower end of the distribution pipe positioning block 10 is fixed to both sides of the lower electrode 7 by screws, and a ball plunger is installed on the upper end to ensure the consistency of the distribution pipe positioning. An insulating sheet is set between the distribution pipe positioning block 10 and the lower electrode 7. The distribution pipe direction error prevention block 11 is fixed to one end of the lower electrode 7 by screws, and an insulating sheet is set between the distribution pipe direction error prevention block 11 and the lower electrode 7.

[0033] The lower electrode 7 is provided with a product stripping mechanism, a movable ejector 12, a driving rod 13, a connecting rod 14, a movable swing block 15, a cylinder connector 16, a second cylinder 17 and a connecting rod support 18. The movable ejector 12 and the lower electrode 7 are clearance-matched, the driving rod 13 is directly inserted into the inner groove of the movable ejector 12, the driving rod 13 is locked by screws and the connecting rod 14, the connecting rod 14 passes through the connecting rod support and the two are clearance-matched and fixed, and the connecting rod support 18 is fixed to the lower die base 2 by inlaying and screw fixing, the inner hole of the movable swing block 18 passes through the connecting rod 14 and slides with the connecting rod 14, and the other end is connected to the cylinder connector 16 by a hinge pin. The cylinder connector 16 is connected to the second cylinder 17 by a thread. When the second cylinder 17 is actuated, it drives the movable swing block 15, the connecting rod 14 and the driving rod 13, and finally drives the movable ejector 12 to be ejected from the injector seat positioning mechanism to complete the product stripping.

[0034] See also Figure 4 A preferred embodiment of the present invention further comprises a method for projection welding using the projection welding tool for the eight-cylinder fuel rail injector seat as described above, comprising the steps of:

[0035] Step S101: using the injector seat positioning mechanism, place eight injector seats in the correct direction and at the correct position on the lower electrode.

[0036] Specifically include: placing eight injector seats on the injector seat locating pins (determining the position), at this time the injector seat direction anti-error block controls the placement direction of the injector seat (determining the direction).

[0037] Step S102: using the distribution pipe positioning mechanism, place the distribution pipe in the correct direction to the correct position on the lower electrode relative to the injector seat.

[0038] Specifically, the distribution pipe is placed on the arc surface of the injector seat, and fits with the convex point on the arc surface of the injector seat. The distribution pipe is positioned by the distribution pipe positioning block (to determine the position) and the distribution pipe direction anti-error block (to determine the direction), thereby ensuring the distribution pipe positioning consistency.

[0039] Step S103, press the double-hand switch, the projection welding machine drives the upper die seat to move downward, and uses the upper electrode to perform projection welding on the four injector seats on the distribution pipe; when the stroke reaches the bottom dead center, the equipment moves upward.

[0040] Specifically, the process includes: pressing the two-hand switch of the equipment, the projection welding machine drives the upper electrode to move downward, and the entire upper electrode on the upper die seat begins to perform projection welding on the four injector seats on the distribution pipe. When the stroke reaches the bottom dead center, the equipment moves upward to complete the welding.

[0041] Step S104, the upward movement is completed, and the cylinder manual valve is pressed to control the first cylinder to drive the four split electrodes forward.

[0042] Specifically, the upward movement is completed, and the manual valve of the cylinder is pressed. At this time, the first cylinder pushes the four split electrodes forward to a fixed position, and is ready to use the split electrodes for projection welding.

[0043] Step S105, press the double-hand switch, the projection welding machine drives the upper die seat to move downward, and uses the split electrode to perform projection welding on the other four injector seats on the distribution pipe; when the stroke reaches the bottom dead center, the equipment moves upward.

[0044] Specifically, the equipment double-hand switch is pressed continuously, and the upper die seat drives the upper electrode downward, and the four split electrodes moving forward are used to perform projection welding on the four unwelded injector seats. After reaching the bottom dead center, the equipment moves upward to complete the welding.

[0045] Step S106, the distribution pipe and the injector seat that have been welded together are removed from the distribution pipe positioning mechanism and the injector seat positioning mechanism respectively, and the material removal is completed.

[0046] Specifically, the manual valve of the mold cylinder is manually pressed, and the second cylinder starts to work, pushing the ejector rod to disengage the welded oil rail (welded by the distribution pipe and 8 injector seats) from the injector seat locating pin and the distribution pipe locating block.

[0047] During the entire projection welding process, since the height of the split electrode is higher than the overall upper electrode height, when the split electrode is used for projection welding of the second group of injector seats, the four injector seats of the first group that have been welded are not affected in any way. The above method is used to complete the projection welding of the injector seats of the eight-cylinder fuel rail, with good welding quality, convenient operation and good economic benefits.

[0048] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An eight-cylinder fuel rail injector seat projection welding tool, characterized in that: It comprises an upper die consisting of an upper electrode and an upper die base, and a lower die consisting of a lower electrode and a lower die base; the upper die base and the lower die base are connected by a guide column assembly; the upper electrode is fixed to the upper die base by inserting or screwing; four split electrodes are arranged in the middle of the upper electrode; the split electrodes are connected to a first cylinder and are driven by the first cylinder to move forward and backward; the first cylinder is screwed to a cylinder fixing plate connected to the upper die base; the lower electrode is fixed to the lower die base by inserting or screwing.

2. The eight-cylinder fuel rail injector seat projection welding tool according to claim 1 is characterized in that: The split electrode and the upper electrode are slidably matched with each other, and the upper electrode guides the forward and backward movement of the split electrode.

3. The eight-cylinder fuel rail injector seat projection welding tool according to claim 1, characterized in that: A fuel injector seat positioning mechanism for determining the position and direction of the fuel injector seat is also provided on the lower electrode; the fuel injector seat positioning mechanism is insulated and connected to the lower electrode.

4. The eight-cylinder fuel rail injector seat projection welding tool according to claim 3 is characterized in that: The injector seat positioning mechanism is composed of an injector seat positioning pin for calibrating the position and an injector seat direction error prevention plate for determining the direction; the outer diameter of the injector seat positioning pin is inlaid with a bakelite insulating sleeve, which is tightly matched with the lower electrode by knocking in; the injector seat direction error prevention plate is fixed to the lower electrode by screws and is located on both sides of the injector seat positioning pin; an insulating sheet is arranged between the injector seat direction error prevention plate and the lower electrode.

5. The projection welding tool for the eight-cylinder fuel rail injector seat according to any one of claims 1 or 3, characterized in that: A distribution pipe positioning mechanism for determining the position and direction of the distribution pipe is also provided on the lower electrode; the distribution pipe positioning mechanism is insulated and connected to the lower electrode.

6. The eight-cylinder fuel rail injector seat projection welding tool according to claim 5 is characterized in that The distribution pipe positioning mechanism is composed of a distribution pipe positioning block for calibrating the position and a distribution pipe direction anti-error block for determining the direction; the lower end of the distribution pipe positioning block is fixed to both sides of the lower electrode by screws, and a ball head plunger is installed on the upper end; an insulating sheet is arranged between the distribution pipe positioning block and the lower electrode; the distribution pipe direction anti-error block is fixed to one end of the lower electrode by screws, and an insulating sheet is arranged between the distribution pipe direction anti-error block and the lower electrode.

7. The eight-cylinder fuel rail injector seat projection welding tool according to claim 1 is characterized in that A product removal mechanism is also provided inside the lower electrode.

8. The eight-cylinder fuel rail injector seat projection welding tool according to claim 7 is characterized in that The product unloading mechanism includes a movable ejector rod, a hitting rod, a connecting rod, a movable pendulum block, a cylinder connecting head, a second cylinder and a connecting rod support; the movable ejector rod and the lower electrode are gap-matched; one end of the hitting rod is inserted into the inner groove of the movable ejector rod, and the other end is fixed by screws and a connecting rod; the connecting rod passes through the connecting rod support and is fixed by gap-matching; the connecting rod support is fixed to the lower die base by inlaying and screwing; the inner hole at one end of the movable pendulum block passes through the connecting rod and slides with the connecting rod, and the other end is connected to the cylinder connecting head by a hinge pin; the cylinder connecting head is connected to the second cylinder by a thread; when the second cylinder is actuated, it drives the movable pendulum block, the connecting rod and the hitting rod, and finally drives the movable ejector rod to be ejected from the injector seat positioning mechanism to complete the product unloading.

9. The projection welding tool for the eight-cylinder fuel rail injector seat according to claim 1, characterized in that: A travel control rod for controlling the downward distance of the upper die base is provided between the upper die base and the lower die base; the travel control rod is locked and fixed with the upper die base and the lower die base through threads.

10. A method for projection welding using the projection welding tool for the eight-cylinder fuel rail injector seat as claimed in claim 5, comprising the steps of: Step S101, using the injector seat positioning mechanism, placing eight injector seats in the correct direction and at the correct position on the lower electrode; Step S102, using the distribution pipe positioning mechanism to place the distribution pipe in a correct direction to a correct position on the lower electrode relative to the injector seat; Step S103, pressing the double-hand switch, the projection welding machine drives the upper die seat to move downward, and projection welding is performed on the four injector seats on the distribution pipe using the upper electrode; When the stroke reaches the bottom dead center, the equipment moves upward; Step S104, when the upward movement is completed, the cylinder manual valve is pressed to control the first cylinder to drive the four split electrodes to move forward; Step S105, pressing the double-hand switch, the projection welding machine drives the upper die seat to move downward, and projection welding is performed on the other four injector seats on the distribution pipe using the split electrode; When the stroke reaches the bottom dead center, the equipment moves upward; Step S106, the distribution pipe and the injector seat that have been welded together are removed from the distribution pipe positioning mechanism and the injector seat positioning mechanism respectively, thereby completing the material removal.

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