A comprehensive process fixture for machining engine connecting rods

Abstract

The present invention relates to a comprehensive process fixture for machining engine connecting rods, which is used in the field of mechanical machining. The fixture includes a rotating four-axis and a disc brake tailstock that work in cooperation with the fixture, and also includes a base plate, a four-axis pad, a tailstock pad, a four-axis connecting plate, a tailstock connecting plate, a rotating bridge plate, a small head positioning device, a large head positioning device and a large head clamping device. This product can automatically clamp the workpiece, has a good clamping effect, and the center distance between the large head and the small head of the positioning connecting rod can be adjusted to adapt to the machining of workpieces of different models, thereby greatly improving the production efficiency of the comprehensive fixture used for machining engine connecting rods, drilling and boring small head hole chamfers, rough boring and chamfering of large head holes, milling reverse surface sinks, milling pressure-bearing surfaces, drilling holes, and tapping threaded holes.

Description

Technical Field

[0001] The invention relates to a comprehensive process fixture for machining an engine connecting rod, which is used in the field of mechanical machining. Background Art

[0002] In the prior art, most of the fixtures for processing the engine connecting rod joint surface and drilling and tapping bolt holes adopt a single-station or small-station arrangement, which makes the production efficiency relatively low. Therefore, in order to improve the production efficiency, a Chinese patent with patent number 201320333640.5 discloses a fixture for processing the engine connecting rod joint surface, including a fixture tire plate, a bolt surface positioning block, a fastening screw, a positioning mandrel, a large-head semicircular flat washer, a bolt surface clamping screw, a small-head circular flat washer, a clamping screw positioning block, a small-head side positioning block, a small-head top positioning block, a large-head top positioning block, and a small-head clamping screw. The fixture tire plate is provided with a large-head semicircular flat washer and a small-head circular flat washer, and the large and small heads of the connecting rod are placed above the two. The big head and small head, and the flat washers have the same thickness. A positioning core shaft connected by a thread is provided on the big head semicircular flat washers. A bolt face positioning block is provided on one side of the big head semicircular flat washers and fixed with a fastening screw, and a bolt face clamping screw is provided on the other side. A big head top positioning block is provided under the big head semicircular flat washers, a small head side positioning block is provided on one side of the small head circular flat washers, and a small head clamping screw is provided on the other side. A small head top positioning block is provided under the small head circular flat washers, the bolt face clamping screws and the small head clamping screws are both installed on the clamping screw positioning block, and the clamping screw positioning block, the small head side positioning block, the small head top positioning block and the big head top positioning block are also fixed on the fixture tire plate with fastening screws, and the positioning pin holes are mostly fixed pin holes.

[0003] The above-mentioned product can clamp multiple workpieces at a time. Although it improves the processing efficiency, it still has the following defects: (1) The clamping device uses a fastening screw to clamp the side of the workpiece. Each time the workpiece is clamped, it is necessary to manually tighten the fastening screws one by one to clamp the workpiece, which makes the clamping operation cumbersome and the work efficiency low. The workpiece is clamped by tightening the locking nut to lock the pressure plate. Since the force of manually tightening the locking nut is limited, the workpiece is clamped by tightening the fastening screw. The clamping force is insufficient and the workpiece may be loose, making it difficult to process in subsequent processing. The processing error is further increased, making it impossible for the workpiece to achieve the required accuracy, greatly increasing the manufacturing cost; (2) The center distance between the big head and the small head of the positioning connecting rod cannot be adjusted. This type of clamp can often only process a single type of connecting rod and cannot adapt to the processing of connecting rods of different models. It has poor versatility and causes low work efficiency. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned defects existing in the prior art and to provide a clamp that can automatically clamp the workpiece, has a good clamping effect, and the center distance between the big head and the small head of the positioning connecting rod can be adjusted to adapt to the processing of workpieces of different models, thereby greatly improving the production efficiency and being used for processing engine connecting rod drilling and boring small head hole chamfers, rough boring big head hole chamfers, milling reverse side countersunks, milling pressure-bearing surfaces, drilling holes, and tapping threaded holes.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A comprehensive process fixture for machining engine connecting rods, including a base plate, a four-axis pad, a tailstock pad, a rotating four-axis, a disc brake tailstock, a four-axis connecting plate, a tailstock connecting plate, a rotating bridge plate, a small head positioning movable upper plate, a plurality of large head positioning devices fixedly arranged in a row on the rotating bridge plate, a plurality of small head positioning devices movably arranged in a row on the small head positioning movable upper plate of the rotatable bridge plate, and a clamping device for clamping a workpiece, wherein the large head positioning device includes a large head positioning device base, a large head positioning device base assembly for pushing and positioning the large head end face and supporting the connecting rod end face positioning, the small head positioning device includes a small head positioning base for positioning the small head shape and supporting the small head end face on the connecting rod, and the clamping device is driven by a cylinder to clamp the workpiece.

[0007] The clamp of the present invention is provided with a row of positioning devices and a clamping device for clamping the workpiece, so that multiple workpieces can be clamped at one time, and the datums are unified, the structure is simple, and the operation is convenient, which not only improves the processing efficiency, but also ensures the accuracy and quality of the workpiece; the clamping device of the clamp of the present invention is driven by a cylinder to clamp the workpiece, can automatically clamp the workpiece, and has a good clamping effect, which greatly improves the processing accuracy of the workpiece; the positioning device of the small head of the positioning connecting rod can be movably arranged, and the positioning device relative to the large head can adjust the center distance between the large head and the small head, so as to adapt to the processing of workpieces with different sizes and models of spacing, and can be used for the processing of connecting rods of various models, with good practicality and greatly improved processing efficiency.

[0008] Preferably, the clamping device comprises a bidirectional clamping member and a unidirectional clamping member driven by a cylinder to clamp the workpieces, adjacent workpieces are clamped by the bidirectional clamping member, and the outer sides of the workpieces at both ends are clamped by the unidirectional clamping member.

[0009] Preferably, the bidirectional clamping member comprises a clamping block 1, a supporting column 1 supporting the clamping block 1 and a cylinder 1 for clamping and adjusting the steering of the clamping block 1, the clamping block 1 comprises a clamping part 1 and a clamping part 2 which are symmetrically arranged and a connecting part 1 connected to the upper end of the supporting column 1, the clamping part 1, the clamping part 2 and the connecting part 1 are an integrated structure, an axial hole 1 is provided at a lower end of the connecting part, an axial hole 2 which matches the axial hole 1 is provided at an upper end of the supporting column 1, a movable pin 1 which connects the clamping block 1 and the supporting column 1 is installed on the axial hole 1 and the axial hole 2, and the clamping block 1 rotates around the supporting column 1 with the movable pin 1 as the axis to achieve clamping and loosening of the workpiece.

[0010] Preferably, the one-way clamping member includes a clamping block 2, a support column 2 supporting the clamping block 2, and a cylinder 2 for clamping and adjusting the steering of the clamping block 2. The clamping block 2 includes a clamping part 3, a support part, and a connecting part 2 connected to the upper end of the support column 2. The clamping part 3, the support part and the connecting part 2 are an integrated structure. An axial hole 3 is provided at the lower end of the connecting part 2, and an axial hole 4 matching the axial hole 3 is provided at the upper end of the support column 2. A movable pin 2 connecting the clamping block 2 and the support column 2 is installed on the axial hole 3 and the axial hole 4. The clamping block 2 rotates around the support column 2 with the movable pin 2 as the axis to achieve clamping and loosening of the workpiece.

[0011] Preferably, the support plate is provided with a support column 1 supporting the support part on the clamping block 2. The workpieces at the two ends of the outer side are clamped by the one-way clamping parts respectively, and the workpieces at the two ends are clamped on their outer sides by the clamping part 3 of the one-way clamping parts. At the same time, in order to improve the balance and clamping force of the one-way clamping parts, a support column 1 is provided at the lower end of the support part to bear the clamping force and better clamp the workpiece; the clamping part 1 and the clamping part 2 included in the two-way clamping parts can clamp the ends of the adjacent workpieces at the same time, making the structure compact, greatly saving the installation space, and having a good clamping effect; the one-way clamping parts are provided with a driving force by the oil cylinder 2 to achieve the clamping and loosening of the workpiece, and the two-way clamping parts are provided with a driving force by the oil cylinder 1 to achieve the clamping and loosening of the workpiece, without manual clamping, which greatly improves the work efficiency and has a good clamping effect, so as to better prepare for the processing of the workpiece. When clamping the workpiece, drive the clamping block 2 to clamp the end of the workpiece relatively. When the workpiece is processed, drive the clamping block 2 to rotate 90 degrees around the support column 2 with the movable pin 2 as the axis through the oil cylinder 2. The clamping block 2 leaves the end of the workpiece, and then releases the workpiece. The processed workpiece can be removed. This is repeated to achieve batch processing of the workpiece. When clamping the workpiece, drive the clamping block 1 to clamp the ends of the two connected workpieces relatively. When the processing is completed, drive the clamping block 1 to rotate 90 degrees around the support column 2 with the movable pin 1 as the axis through the oil cylinder 1. The clamping block 1 leaves the end of the workpiece, and then releases the workpiece. The processed workpiece can be removed. This is repeated to achieve batch processing of the workpiece. The angle cylinder clamps and releases at 90 degrees, which makes the loading and unloading of the workpiece convenient and greatly improved.

[0012] Preferably, the clamping part one, the clamping part two and the clamping part three are respectively provided with a large head pressure block.

[0013] Big head pressure blocks are respectively provided on the clamping part one, the clamping part two and the clamping part three. When processing workpieces of different sizes and models, due to the different thicknesses of the connecting rods of the workpieces, the big head pressure blocks can be used to adjust the relative positions of the two-way clamping parts and the one-way clamping parts and the connecting rods according to the needs of the clamping parts with different thicknesses of the connecting rods, so as to clamp the workpieces. The big head pressure blocks can be used to cooperate with the processing of connecting rods of different models. The structure is simple and the flexibility is good. It can be applied to the processing of various connecting rods with similar structures, which greatly saves the research and development time and production cost of the fixture.

[0014] The small head positioning device is an integrated structure, and includes a movable upper plate for small head positioning, a T-nut on the movable upper plate for small head positioning, a V-shaped and end face positioning block for small head shape positioning and supporting connecting rod small head positioning, a small head positioning base on the small head end face of the supporting connecting rod, and a small head clamping device; the T-nut on the movable upper plate for small head positioning can play a role of positioning and fixing by being inserted into the T-slot of the rotatable bridge plate.

[0015] The small head positioning moving upper plate, the small head positioning base, the small head shape positioning and the supporting connecting rod small head end face positioning block, and the small head clamping cylinder device are set as an integrated structure, which has a simple structure and is easy to install; according to the needs of the workpiece connecting rod size, the center distance between the small head positioning device and the large head positioning device is adjusted to position the connecting rod. When the center distance between the small head positioning device and the large head positioning device is adjusted to the required center distance, the T-nut is passed through the mounting hole on the adjusting block, and the lower end of the nut T is embedded in the T-slot, and then the T-nut is relatively tightened. A similar method is used to adjust the processing of other different types of connecting rods. It has good flexibility and can be applied to the processing of various connecting rods with similar structures. This fixture integrates the previous 1. rough boring of large head holes and chamfering, 2. drilling and boring of small head holes and chamfering, 3. processing of reverse side countersunk, and 4. processing of pressure surface drilling and tapping processes. The four fixtures are integrated into a one-sequence fixture, which greatly saves fixture research and development time and production costs, and saves machine tool costs and personnel arrangement costs.

[0016] The small head is positioned in an inverted cone fixed V shape.

[0017] The big head positioning device is a self-centering centering mechanism.

[0018] The small head is positioned as an inverted cone fixed V shape, which plays a role in positioning and supporting the workpiece. The large head positioning device is a self-centering centering mechanism, which plays a role in positioning and supporting the workpiece and can also prevent the workpiece from rotating, thereby better positioning the workpiece connecting rod.

[0019] Preferably, it also includes a four-axis pad for supporting the supporting rotating four-axis, one side of the four-axis pad bears the weight of the bottom surface of the rotating four-axis, and the other side is fixed to the base plate; it also includes a tailstock pad for supporting the supporting disc brake tailstock, one side of the tailstock pad bears the weight of the bottom surface of the disc brake tailstock, and the other side is fixed to the base plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the present invention or the solutions in the prior art, the drawings used in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is the structure of the product Figure 1 .

[0022] Figure 2 This is the structure of the product Figure 2 .

[0023] Figure 3 This is a schematic diagram of the small head positioning mechanism of this product Figure 3 .

[0024] Figure 4 This is the front view of an embodiment of the clamp connecting rod of this product after clamping.

[0025] Figure 5 This is a schematic diagram of the structure of the large end face positioning and center clamping of this product.

[0026] Figure 6 This is a structural diagram of the small head end face and shape positioning mechanism of this product.

[0027] Figure 7 This is an exploded view of the large-head bidirectional clamping part of this product.

[0028] Figure 8 This is the exploded view of the large-head one-way clamp of this product.

[0029] Explanation of some reference numerals: rotating four-axis 1, disc brake tailstock 2, base plate 100, four-axis pad 200, tailstock pad 300, four-axis connecting plate 400, tailstock connecting plate 500, rotatable bridge plate 600, small head positioning device 700, large head positioning device 800, large head clamping device 900. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Example:

[0032] like Figure 1-4As shown, as an embodiment of the present invention, a fixture for machining engine drilling and boring small-head hole chamfers, rough boring large-head hole chamfers, milling reverse surface countersunks, milling pressure-bearing surfaces, drilling holes, and tapping threaded holes comprises a base plate 100, a rotating four-axis 1 (i.e., a CNC large-aperture rotating worktable is a purchased standard part) arranged on the base plate 100 and parallel to the base plate 100 and fixed to a four-axis pad 200, a disc brake tailstock 2 (purchased standard part) fixed to a tailstock pad 300, a four-axis connecting plate 400 fixed to the rotating four-axis, a tailstock connecting plate 500 fixed to the disc brake tailstock 2, and a rotatable bridge plate 600 fixed to the four-axis connecting plate 400 and the tailstock connecting plate 500;A plurality of large head positioning devices 800 are fixedly arranged in a row on the rotatable bridge plate 600, a plurality of small head positioning devices 700 are movably arranged in a row on the rotatable bridge plate 600 (movable), and a large head clamping device 900 for clamping a workpiece is arranged on the rotatable bridge plate 600, wherein the large head positioning device 800 includes a large head positioning device base 801 for centering the large head shape, a large head positioning end face block 802 for pushing and positioning the large head end face, and a large head pushing and positioning pressure plate 803 for supporting the end face positioning of the connecting rod, and a large head positioning device base 801 for supporting the large head end face on the connecting rod, and the small head positioning device 700 includes a movable upper plate 701 for small head positioning, a T-shaped movable upper plate for small head positioning, and a large head positioning device base 801 for supporting the large head end face on the connecting rod. Nut 702, small head shape positioning and supporting the small head end face 704 on the connecting rod, small head positioning base 703 of the small head end face on the supporting connecting rod and small head clamping device 1000, the big head positioning device 800, the big head positioning device base 801 is fixed on the rotatable bridge plate 600 by screws, the big head positioning end face block 802 is fixed on the big head positioning device base 801 by screws, the big head pushing and positioning pressure plate 803 is fixed on the transmission shaft 804 through a hole, the transmission shaft 804 is fixed on the hole of the big head positioning device base 801, the left side centering pressure plate 805 is fixed on the centering transmission shaft 806 through a hole, the centering transmission shaft 806 is fixed on the big head positioning device base 801 through a hole, and the right side The centering pressure plate 807 is fixed on the centering transmission shaft 806 through a hole, and the left and right centering pressure plates 805807 realize automatic centering and clamping of the workpiece through the self-centering cylinder 1200. The large head push positioning pressure plate 803 pushes the clamped workpiece through the self-centering cylinder 1200. The small head positioning device 700 and the small head positioning movable upper plate 701 are connected with the rotatable bridge plate 600 through the small head positioning movable upper plate T-nut 702 to realize the adjustment of the connecting rod with different center distances. The small head positioning base 703 is fixed on the small head positioning movable upper plate 701 through threads, and the small head positioning V-shaped and end face positioning block 704 is fixed on the small head positioning base 703 through threads. The small head clamping device 1000 is fixed on the small head through threads. On the positioning movable upper plate 701, a corresponding workpiece such as an engine connecting rod is positioned through a large head positioning device 800 and a small head positioning device 700, and then the large head clamping device 900 and the small head clamping device 1000 clamp the large head ends and the small head section of the engine connecting rod for clamping, and then the large head hole and the small head hole of the engine connecting rod can be drilled, bored, and the positive and negative chamfering process can be performed. When the rotating four-axis rotates 90 degrees, the disc brake tailstock is fixed and then the reverse side of the engine connecting rod is milled. After the processing is completed, the disc brake tailstock is relaxed, and when the rotating four-axis rotates to 270 degrees, the disc brake tailstock is fixed and the pressure-bearing surface, drill bolt holes and bolt holes on the engine connecting rod can be drilled and tapped. ;

[0033] In this embodiment, if Figure 5 , 6As shown, the big-end clamping device 900 includes a two-way clamping member 901 and a one-way clamping member 902 driven by a cylinder to clamp the workpieces. Adjacent workpieces are clamped by the two-way clamping member 901, and the workpieces located at both ends are clamped to the big end of the engine connecting rod by the one-way clamping member 902. The small-end clamping device 1000 includes a left two-way clamping member 1001 and a right two-way clamping member 1002 driven by a cylinder to clamp the workpieces. Adjacent workpieces are clamped to the small end of the engine connecting rod by the left two-way clamping member 1001 and the right two-way clamping member 1002. It has a simple structure, is easy to operate, and has a good clamping effect.

[0034] like Figure 7 As shown, the bidirectional clamping member 901 includes a clamping block 903, a support column 904 supporting the clamping block 903, and a cylinder 905 for clamping and adjusting the steering of the clamping block 903. The clamping block 903 includes a clamping part 9031 and a clamping part 9032 symmetrically arranged, and a connecting part 9033 connected to the upper end of the support column 904. The clamping part 9031, the clamping part 9032 and the connecting part 9033 are a The connecting portion 9033 has a lower end with an axial hole 9034, and the supporting column 904 has an upper end with an axial hole 9041 matched with the axial hole 9034. A movable pin 906 for connecting the clamping block 903 and the supporting column 904 is installed on the axial hole 9034 and the axial hole 9041. The clamping block 903 rotates around the supporting column 904 with the movable pin 906 as the axis to achieve clamping and loosening of the workpiece.

[0035] like Figure 8As shown, the one-way clamping member 902 includes a clamping block 907, a support column 908 supporting the clamping block 907, and a cylinder 909 for clamping and adjusting the steering of the clamping block 907. The clamping block 907 includes a clamping portion 9071, a support portion 9072, and a connecting portion 9073 connected to the upper end of the supporting column 908. The clamping portion 9071, the support portion 9072, and the connecting portion 9073 are an integrated structure. The lower end of the connecting portion 9073 is provided with an axial hole 9074, and the upper end of the supporting column 908 is provided with an axial hole 9081 matched with the axial hole 9074. The clamping block 907 is installed on the axial hole 9074 and the axial hole 9081. The movable pin 2 910 connects the clamping block 907 and the support column 2 908, and the clamping block 907 rotates around the support column 2 908 with the movable pin 2 910 as the axis to achieve clamping and loosening of the workpiece. In order to cooperate with the supporting balance of the support column 2 908, a support column 1 904 supporting the supporting part 9072 on the clamping block 2 907 is also provided on the support plate 600, so as to further improve the clamping force of the one-way clamping member 902 to clamp the workpiece engine connecting rod. Moreover, since the model of the workpiece engine connecting rod processed each time is different, the upper end of the corresponding support column 3 904 can cooperate with the processing of engine connecting rods of different specifications and models by adding or reducing gaskets such as nuts or other pads that can replace gaskets.

[0036] During clamping, the workpieces at the two ends of the outer side are clamped by the one-way clamping member 902 respectively, and the workpieces at the two ends are clamped on their outer sides by the clamping part three 9071 of the one-way clamping member 902. At the same time, in order to improve the balance and clamping force of the one-way clamping member 902, a support column 904 is provided at the lower end of the support part 9072 to bear the clamping force and better clamp the workpiece; the clamping part 1 9031 and the clamping part 2 9032 included in the two-way clamping member 901 can clamp the ends of the adjacent workpieces at the same time, making the structure compact, greatly saving the installation space, and having a good clamping effect; the one-way clamping member 902 is provided with a driving force by the oil cylinder 2 909 to achieve the clamping and loosening of the workpiece, and the two-way clamping member 901 is provided with a driving force by the oil cylinder 1 905 to achieve the clamping and loosening of the workpiece, without manual clamping, which greatly improves the work efficiency and has a good clamping effect, so as to better prepare for the processing of the workpiece. When clamping the workpiece, the clamping block 907 is driven to clamp the end of the workpiece relatively. When the workpiece is processed, the clamping block 907 is driven by the oil cylinder 909 to rotate 90 degrees around the support column 2 with the movable pin 910 as the axis. The clamping block 907 leaves the end of the workpiece, and then the workpiece is released. The workpiece that has been processed can be removed. This is repeated to achieve batch processing of the workpiece. When clamping the workpiece, the clamping block 903 is driven to clamp the ends of the two connected workpieces relatively. When the processing is completed, the clamping block 903 is driven by the oil cylinder 905 to rotate 90 degrees around the support column 2 with the movable pin 906 as the axis. The clamping block 903 leaves the end of the workpiece, and then the workpiece is released. The workpiece that has been processed can be removed. This is repeated to achieve batch processing of the workpiece. The angle cylinder clamps and releases at 90 degrees, which makes the loading and unloading of the workpiece convenient and greatly improved.

[0037] In the present embodiment, in order to adapt to the processing of engine connecting rods of different specifications and models, big head pressure blocks 912 are respectively provided on the clamping part 1 9031, the clamping part 2 9032 and the clamping part 3 9071. According to the processing requirements of the engine connecting rod, the clamping effect of the clamping part 1 9031, the clamping part 2 9032 and the clamping part 3 9071 on the workpiece engine connecting rod is adjusted by increasing or reducing the big head pressure block 912. In the present embodiment, the big head pressure block 612 is movably arranged on the clamping part 1 9031, the clamping part 2 9032 and the clamping part 3 9071, and the big head pressure block 912 is removed or installed from the clamping part 1 9031, the clamping part 2 9032 and the clamping part 3 9071 by fasteners. When processing workpieces of different sizes and models, since the thickness of the connecting rod of the workpiece is different, according to the different thickness of the connecting rod, the big head pressure block 912 can be used to adjust the relative positions of the two-way clamping member 901 and the one-way clamping member 902 and the connecting rod, and then clamp the workpiece. The big head pressure block 912 is used to cooperate with the processing of connecting rods of different models. It has a simple structure and good flexibility. It can be applied to the processing of various connecting rods with similar structures, which greatly saves the research and development time and production cost of the fixture.

[0038] In this embodiment, if Figure 6 As shown, the small head positioning device 700, the small head positioning movable upper plate 701 is connected with the rotatable bridge plate 600 through the small head positioning movable upper plate T-nut 702 to realize the adjustment of connecting rods with different center distances, the small head positioning base 703 is fixed on the small head positioning movable upper plate 701 by threads, the small head positioning V-shaped and end face positioning block 704 is fixed on the small head positioning base 703 by threads, and the small head clamping device 1000 is fixed on the small head positioning movable upper plate 701 by threads, and the overall mechanism is adjusted by loosening or tightening the bolts on the countersunk head of the small head positioning movable upper plate 701 and the fixing of the positioning T-nut 702 to realize the installation and clamping of engine connecting rods with different center distances, and a similar method is used to adjust the processing of other connecting rods of different models, which has good flexibility and can be applied to the processing of various connecting rods with similar structures, greatly saving the fixture research and development time and production cost.

[0039] In this embodiment, the small head is positioned as an inverted cone fixed V shape, and the large head positioning device is a self-centering centering mechanism, which plays a role in positioning and supporting the workpiece. The large head self-centering centering mechanism can also prevent the workpiece from rotating and better position the workpiece connecting rod.

[0040] like Figure 1As shown, it also includes a rotating four-axis (purchased standard part) used to support the supporting base plate 100 and fixed on the four-axis pad 200 parallel to the base plate 100, a disc brake tailstock (purchased standard part) fixed on the tailstock pad 300, a four-axis connecting plate 400 fixed on the rotating four-axis, a tailstock connecting plate 500 fixed on the disc brake tailstock, and a rotatable bridge plate 600 fixed to the four-axis connecting plate 400 and the tailstock connecting plate 500, which play a reinforcing role, improve the firmness of the fixture, and thereby improve the stability of workpiece processing.

[0041] At the end of the specification: Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

[0042] In conclusion, the above is only a preferred embodiment of the present invention, and all equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the patent of the present invention.

Claims

1. A comprehensive process fixture for machining engine connecting rods, comprising a rotating four-axis (1) and a disc brake tailstock (2) that cooperate with the fixture, characterized in that: The invention also comprises a base plate (100), a four-axis pad (200), a tailstock pad (300), a four-axis connecting plate (400), a tailstock connecting plate (500), a rotatable bridge plate (600), a small head positioning device (700), a large head positioning device (800) and a large head clamping device (900), wherein the rotating four-axis (1) is arranged on the base plate (100) and is fixed on the four-axis pad (200) parallel to the base plate (100); the disc brake tailstock is fixed on the tailstock pad (300); the four-axis connecting plate (40 0) is fixed on the rotating four-axis (1), and the tailstock connecting plate (500) is fixed on the disc brake tailstock (2); the rotatable bridge plate (600) is fixed to the four-axis connecting plate (400) and the tailstock connecting plate (500); a plurality of rows of large head positioning devices (800) are fixedly arranged on the rotatable bridge plate (600); a plurality of rows of small head positioning devices (700) are movably arranged on the rotatable bridge plate (600); the large head clamping device (900) is arranged on the rotatable bridge plate (600) for clamping the workpiece; The big head positioning device (800) comprises a big head positioning device base (801) for centering the big head shape, a big head positioning end face block (802) for pushing and positioning the big head end face, and a big head pushing and positioning pressure plate (803) for supporting the end face positioning of the connecting rod; the big head positioning device base (801) supports the big head end face on the connecting rod; the small head positioning device (700) is an integrated structure, and the small head positioning device (700) comprises a movable upper plate (701) for positioning the small head, a T-shaped nut (702) for positioning the small head, a small head positioning V-shaped and end face positioning block (704) for positioning the small head shape and supporting the small head end face on the connecting rod, a small head positioning base (703) for supporting the small head end face on the connecting rod, and a small head clamping device (1000); The large head clamping device (900) comprises a bidirectional clamping member (901) and a unidirectional clamping member (902), and adjacent workpieces are clamped by the bidirectional clamping member (901), and the large heads of the workpieces located at the two ends are clamped by the unidirectional clamping member (902); the small head clamping device (1000) comprises a left bidirectional clamping member (1001) and a right bidirectional clamping member (1002), and the small heads of adjacent workpieces are clamped by the left bidirectional clamping member (1001) and the right bidirectional clamping member (1002); The large head positioning device (800) is used to position the large head blank of the workpiece in a central position. The large head positioning device base (801) is fixed on the rotatable bridge plate (600). The large head positioning end face block (802) is fixed on the large head positioning device base (801). The large head pushing and positioning pressure plate (803) is fixed on the transmission shaft (804) through a hole. The transmission shaft (804) is fixed on the hole of the large head positioning device base (801). The left central pressure plate (805) is fixed on the hole. The centering drive shaft (806) is fixed on the big head positioning device base (801) through a hole, and the right centering pressure plate (807) is fixed on the centering drive shaft (806) through a hole. The left centering pressure plate (805) and the right centering pressure plate (807) realize automatic centering and clamping of the workpiece through a self-centering cylinder (1200), and the big head push-positioning pressure plate (803) pushes and clamps the workpiece through the self-centering cylinder (1200).

2. The comprehensive process fixture for machining engine connecting rods according to claim 1 is characterized in that: The bidirectional clamping member (901) comprises a clamping block (903), a support column (904) supporting the clamping block (903), and a cylinder (905) for clamping and adjusting the direction of the clamping block (903). The clamping block (903) comprises a clamping portion (9031) and a clamping portion (9032) symmetrically arranged, and a connecting portion (9033) connected to the upper end of the support column (904). The clamping portion (9031), the clamping portion (9032) and the connecting portion (9033) are integrated. The structure comprises: the lower end of the connecting portion 1 (9033) is provided with an axial hole 1 (9034); the upper end of the supporting column 1 (904) is provided with an axial hole 2 (9041) matched with the axial hole 1 (9034); a movable pin 1 (906) connecting the clamping block 1 (903) and the supporting column 1 (904) is installed on the axial hole 1 (9034) and the axial hole 2 (9041); the clamping block 1 (903) rotates around the supporting column 1 (904) with the movable pin 1 (906) as the axis to achieve clamping and loosening of the workpiece.

3. The comprehensive process fixture for machining engine connecting rods according to claim 2 is characterized in that: The one-way clamping member (902) comprises a clamping block 2 (907), a supporting column 2 (908) supporting the clamping block 2 (907), and a cylinder 2 (909) for clamping and adjusting the steering of the clamping block 2 (907). The clamping block 2 (907) comprises a clamping portion 3 (9071), a supporting portion (9072), and a connecting portion 2 (9073) connected to the upper end of the supporting column 2 (908). The clamping portion 3 (9071), the supporting portion (9072), and the connecting portion 2 (9073) are an integrated structure. The lower end of the second connecting portion (9073) is provided with an axial hole three (9074), and the upper end of the second supporting column (908) is provided with an axial hole four (9081) that matches the axial hole three (9074). A movable pin two (910) that connects the clamping block two (907) and the second supporting column (908) is installed on the axial hole three (9074) and the axial hole four (9081). The clamping block two (907) rotates around the second supporting column (908) with the movable pin two (910) as the axis to achieve clamping and loosening of the workpiece.

4. The comprehensive process fixture for machining engine connecting rods according to claim 3 is characterized in that: The rotatable bridge plate (600) is provided with a support column 1 (904) for supporting a support portion (9072) on the clamping block 2 (907).

5. The comprehensive process fixture for machining engine connecting rods according to claim 3 is characterized in that: The clamping part one (9031), the clamping part two (9032) and the clamping part three (9071) are respectively provided with a large head pressing block (912).

6. The comprehensive process fixture for machining engine connecting rods according to claim 1, characterized in that: The small head positioning device (700) is connected to the rotatable bridge plate (600) through the small head positioning movable upper plate T-nut (702) to achieve the adjustment of connecting rods with different center distances. The small head positioning base (703) is fixed to the small head positioning movable upper plate (701) through threads. The small head positioning V-shaped and end face positioning blocks (704) are fixed to the small head positioning base (703) through threads. The small head V-shaped and end face positioning blocks (704) position the workpiece small head shape blank. The small head clamping device (1000) is fixed to the small head positioning movable upper plate (701) through threads.

7. The comprehensive process fixture for machining engine connecting rods according to claim 1 is characterized in that: The four-axis connecting plate (400) and the tailstock connecting plate (500) are used to support the rotatable bridge plate (600); one side of the four-axis connecting plate (400) is connected to the rotatable bridge plate (600) and one side is fixed to the rotating four-axis (1); one side of the tailstock connecting plate (500) is connected to the rotatable bridge plate (600) and one side is fixed to the disc brake tailstock (2).

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