Bar tube material plate type rolling groove bending and brittle breaking blanking device and method

Abstract

The present application relates to metal plastic forming process and equipment technical field, provide a kind of bar tube material plate type rolling groove bending brittle fracture blanking device and method, the device includes oppositely arranged plate type upper die and plate type lower die, plate type lower die is male die, slotting section, transition loading section, loading section, transition unloading section are sequentially arranged, for bar tube material is slotting and bending brittle fracture;Plate type upper die is female die, is provided with slotting section and the matching section corresponding with plate type lower die;Plate type lower die and plate type upper die are moved towards equal speed, bar tube material is rolled groove, bending brittle fracture, complete blanking.The present application combines two processes of rolling groove and bending into one process for the first time by plate rolling method, greatly improves production efficiency, and can also be used for different diameter metal bar tube material to obtain various length bar tube parts, wide application range, can be mass-produced precision blanking, meet the concept of green manufacturing and precision manufacturing, with broad application prospect.

Description

Technical Field

[0001] This invention relates to the field of metal plastic forming technology and equipment, and in particular to a bar / tube plate-type groove bending and brittle fracture feeding device and method. Background Technology

[0002] Metal bars and tubes are in high demand and have a wide range of applications, making them an important component in the machinery manufacturing industry. Currently, most bar and tube parts required in industrial production, such as bearing rollers, bearing inner and outer rings, some bushings, and retaining rings, are obtained from the raw materials of bar and tube blanks. Because the cross-section of bar and tube blanks is prone to significant deformation during the blanking process, a reasonable blanking method must be adopted to obtain qualified blanks.

[0003] In addition to requiring a flat cross-section, small burrs, material savings, high productivity, and low pollution, the cutting of metal bars and tubes must also ensure minimal distortion of the cross-sectional shape, ideally achieving precision cutting, to avoid secondary processing due to substandard cross-sectional quality.

[0004] Many scholars at home and abroad have been conducting research on improving the cross-sectional quality of bar and tube blanks and are also seeking other new blanking methods. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a bar / tube plate-type groove bending and brittle fracture blanking device and method. The blanking method of this invention has a simple design process, high production efficiency, high blanking dimensional accuracy, flat cross-section, and no material loss.

[0006] The present invention adopts the following technical solution:

[0007] On one hand, the present invention provides a bar / tube material plate-type groove bending and brittle fracture unloading device, including a plate-type upper mold and a plate-type lower mold arranged opposite to each other, wherein the plate-type upper mold and the plate-type lower mold are both flat plates in whole;

[0008] The plate-type lower mold is a punch, which is sequentially set with a grooving section, a transition loading section, a loading section, and a transition unloading section, and is used to groove and bend the bar tube material to prevent brittle fracture.

[0009] The plate-type upper mold is a concave mold, which is provided with a slotted section and a mating section corresponding to the slotted section, transition loading section, loading section and transition unloading section;

[0010] The lower plate mold and the upper plate mold move towards each other at the same speed, with the direction of movement perpendicular to the axis of the bar / tube material, to groove, bend, and break the bar / tube material, thus completing the material cutting.

[0011] In addition to any of the possible implementations described above, another implementation is provided in which the slotting section of the plate-type lower die is provided with a first protruding ridge with a gradually increasing height, for rolling a V-shaped groove on the bar stock, and the length of the first protruding ridge is greater than the circumference of the bar stock.

[0012] The slotted section of the plate mold is provided with a second protruding ridge corresponding to the first protruding ridge, and the first and second protruding ridges are symmetrically arranged with the bar material as the center.

[0013] In addition to any of the possible implementations described above, another implementation is provided in which the transition loading section of the lower plate mold is provided with a breaking taper boss that gradually rises along the bar stock axis; and the transition loading mating section of the upper plate mold is provided with a breaking taper recess corresponding to the breaking taper boss.

[0014] The loading section of the lower plate mold is provided with a broken taper boss of fixed height; the loading mating section of the upper plate mold is provided with a broken taper recess corresponding to the broken taper boss.

[0015] In addition to any of the possible implementations described above, another implementation is provided in which the included angle α of the V-shaped groove is 90°, the radius r of the bottom fillet is 0.1 to 0.3 mm, and the ratio of the groove depth h to the diameter of the bar / tube material D is 0.15 to 0.2.

[0016] In addition to any of the possible implementations described above, a further implementation is provided in which the taper of the broken tapered boss is 7°-9°.

[0017] In addition to any of the possible implementations described above, another implementation is provided in which the front end of the slotted section of the plate-type lower mold is provided with a wedge fixing groove that defines the starting position of the round bar tube, and the wedge fixing groove is an arc groove.

[0018] In addition to any of the possible implementations described above, a further implementation is provided in which a fixing sleeve is provided at the wedge fixing groove to fix the position of the bar / tube material, ensuring that the position of the bar / tube material remains fixed during the rolling and bending processes.

[0019] In addition to any of the possible implementations described above, a further implementation is provided in which the rear end of the transition unloading section of the plate-type lower mold is provided with a groove for receiving rod-tube-like parts.

[0020] In addition to any of the possible implementations described above, another implementation is provided in which the material of the rod / tube stock is a cold-brittle material, including high-strength steel and alloy steel.

[0021] In addition to any of the possible implementations described above, another implementation is provided in which the diameter of the rod / tube material ranges from 10 mm to 100 mm.

[0022] On the other hand, the present invention also provides a method for blanking bar and tube stock by bending brittle fracture in a plate-type rolling mill. The method uses a bar and tube stock blanking device by bending brittle fracture in a plate-type rolling mill, and the method includes the following steps:

[0023] S1. Feeding: The bar / tube material is fed to the starting rolling position at the front end of the slotted section of the lower plate die.

[0024] S2. Grooving and bending: The lower plate die and the upper plate die move towards each other at the same speed. The bar and tube material is rolled into a V-groove under the action of the gradually rising convex ridge in the grooving section. After passing through the transition loading section, the blanking section is bent and brittlely broken under the bending force of the breaking tapered boss in the loading section. The blanking section is collected after being unloaded in the transition unloading section.

[0025] S3. The lower plate die and the upper plate die return to their initial positions, and the material is fed back to the starting rolling position. Repeat steps S1-S2 to complete continuous feeding.

[0026] In addition to any of the possible implementations described above, another implementation is provided in which, in step S1, a feeding device is used to feed the bar material to the wedge fixing groove at the front end of the slotted section of the plate-type lower mold; in step S2, the unloading section is collected into the groove after being unloaded in the transition unloading section.

[0027] The working principle of this invention is as follows: After determining the blanking dimensions, the bar / tube material is fed into the upper and lower plate-type molds. The upper and lower plate-type molds move in parallel towards each other at a constant speed v. Figure 2 As shown; the metal rod / tube blank is first slotted, then a load is slowly applied until it is fully loaded and breaks, then unloaded, and guided by the upper and lower plate dies, the blank section (rod / tube blank part blank) flows into the groove section, see... Figure 4 At this point, the upper and lower plates return to their initial positions at a certain speed for the next rolling operation.

[0028] The beneficial effects of this invention are as follows: This invention is the first to combine the two processes of grooving and bending into one process through plate rolling, which greatly improves production efficiency. It can also be used to produce bar and tube parts of various lengths from metal bars and tubes of different diameters. It has a wide range of applications, can be used for large-scale precision cutting, conforms to the concepts of green manufacturing and precision manufacturing, and has broad application prospects. Attached Figure Description

[0029] Figure 1 The diagram shown is a structural schematic of a bar / tube plate-type groove bending and brittle fracture feeding device according to an embodiment of the present invention.

[0030] Figure 2 The diagram shown illustrates the motion relationship between the upper and lower plate molds in this embodiment.

[0031] Figure 3 The diagram shown is a schematic of the plate-type lower mold structure in the embodiment.

[0032] Figure 4 The diagram shown is a schematic of the bending and brittle fracture of the bar / tube material in the embodiment.

[0033] Figure 5 The example shown is from an embodiment. Figure 2 Schematic diagram of section AA.

[0034] Figure 6 The diagram shown is a schematic diagram of the grooved bar material in the embodiment.

[0035] Figure 7 The diagram shows a comparison of the fracture effects of the conventional method and the method of the present invention; (a) top side view; (b) top view.

[0036] In the diagram: 1-Upper plate mold; 2-Metal rod / tube material; 3-Lower plate mold; 4-Cutting section; 5-Wedge fixing groove; 6-Groove; 7-First protruding ridge; 31-Slotted section; 32-Transition loading section; 33-Loading section; 34-Transition unloading section. Detailed Implementation

[0037] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the technical features or combinations of technical features described in the following embodiments should not be considered in isolation, but can be combined with each other to achieve better technical effects.

[0038] like Figure 1 As shown, an embodiment of the present invention provides a bar / tube material plate-type groove bending and brittle fracture unloading device, including a plate-type upper mold 1 and a plate-type lower mold 3 arranged opposite to each other. The plate-type upper mold 1 and the plate-type lower mold 3 are both flat and arranged in parallel.

[0039] The plate-type lower mold 3 is a punch, and is provided with a slotting section 31, a transition loading section 32, a loading section 33, and a transition unloading section 34 in sequence, which are used to slot and bend the rod and tube material 2 to prevent brittle fracture.

[0040] The plate-type upper mold 1 is a concave mold, which is provided with a slotted section and a mating section corresponding to the transition loading section 32, loading section 33 and transition unloading section 34;

[0041] The lower plate mold 3 and the upper plate mold 1 move towards each other at the same speed, with the direction of movement perpendicular to the axis of the bar / tube material. Figure 2 As shown, the bar tube material 2 is grooved, bent and broken to complete the cutting process.

[0042] In one specific embodiment, the slotted section 31 of the plate-type lower die 3 is provided with a first protruding rib 7 with a gradually increasing height, which is used to roll a V-shaped groove on the bar stock 2. The length of the first protruding rib 7 is greater than the circumference of the bar stock 2.

[0043] The slotted section of the plate mold 1 is provided with a second protruding ridge (not shown in the figure) corresponding to the first protruding ridge 7. The first protruding ridge 7 and the second protruding ridge are symmetrically arranged with the rod / tube material 2 as the center. Figure 1 As shown.

[0044] Figure 3 The image shows a partially enlarged view of a first convex ridge 7 (grooving ridge).

[0045] In one specific embodiment, the transition loading section 32 of the lower plate mold 3 is provided with a break-tapered boss that gradually rises along the axial direction of the bar tube 2; the transition loading mating section of the upper plate mold 1 is provided with a break-tapered recess corresponding to the break-tapered boss.

[0046] The loading section of the lower plate mold 3 is provided with a fixed-height break-tapered boss; the loading mating section of the upper plate mold 1 is provided with a break-tapered recess corresponding to the break-tapered boss. The break-tapered boss is as follows: Figure 4 As shown.

[0047] When the local stress at the root of the V-groove reaches the material's yield limit, the tip will undergo plastic deformation, alleviating the high elastic stress and reducing the stress concentration factor. In a specific embodiment, such as... Figure 6 As shown, the included angle α of the V-shaped groove is 90°, the radius r of the groove bottom fillet is 0.1–0.3 mm, and the ratio of the groove depth h to the diameter of the rod / tube material 2 is 0.15–0.2. Under these design parameters, a better bending section effect of the rod / tube material 2 can be achieved, with a smooth cross-section and fewer burrs.

[0048] In one specific embodiment, the taper of the fracture taper boss is 7°-9°. The selection of the taper is mainly based on the mechanical properties and microstructure of the material; it should not be too small or too large. If the taper is too small, the rod / tube material 2 will not break during a single bend; if the taper is too large, the cross-sectional quality of the material will be poor. The specific precise angle can be determined based on experimental results.

[0049] In one specific embodiment, such as Figure 3 As shown, the front end of the slotted section 31 of the plate-type lower mold 3 is provided with a wedge fixing groove 5 that limits the starting position of the round bar tube 2. The wedge fixing groove 5 is an arc groove.

[0050] In one specific embodiment, such as Figure 3As shown, the rear end of the transition unloading section 34 of the plate-type lower mold 3 is provided with a groove 6 for receiving rod-shaped parts.

[0051] In one specific embodiment, the material of the rod / tube 2 is a cold-brittle material, including high-strength steel and alloy steel.

[0052] In one specific embodiment, the diameter of the rod / tube material 2 ranges from 10mm to 100mm.

[0053] This invention provides a method for blanking bar / tube stock that has undergone brittle fracture due to bending in a plate-type rolling mill. The method utilizes a bar / tube stock blanking device for brittle fracture due to bending in a plate-type rolling mill, and includes the following steps:

[0054] S1. Feeding: The bar / tube material 2 is fed to the starting rolling position at the front end of the slotted section 31 of the plate-type lower die 3; in this embodiment, it is the starting wedge fixing groove 5;

[0055] S2. Grooving and Bending: The lower plate die 3 and the upper plate die 1 move towards each other at the same speed (both speeds v). Under the action of the gradually rising convex edges (first convex edge 7 and second convex edge) of the grooving section 31, the bar / tube material 2 is rolled into a V-groove, as shown below. Figure 5 As shown; after passing through the transition loading section 32, under the bending force of the fracture tapered boss of the loading section 33, the unloading section 4 is bent and brittlely broken, and the unloading section 4 is collected after being unloaded in the transition unloading section 34.

[0056] S3, the lower plate die 3 and the upper plate die 1 return to their initial positions, and the material is fed back to the starting rolling position. Steps S1-S2 are repeated to complete continuous feeding.

[0057] In one specific embodiment, in step S1, the bar material 2 is fed to the wedge fixing groove 5 at the front end of the slotted section 31 of the plate-type lower die 3 using a feeding device; the feeding length of the feeding device can be adjusted to roll out blanking sections 4 (bar material blanks) of different lengths; in step S2, the blanking section 4 is collected into the groove 6 after being unloaded in the transition unloading section 34.

[0058] To ensure that the position of the bar stock 2 remains stationary during the rolling process, the feeding device feeds the bar stock 2 through a fixed sleeve along the wedge-starting fixing groove 5 set at the front end of the slotting section 31 of the lower die of the plate type 3. When the upper and lower dies of the plate type 1 and 3 move towards each other, the fixed sleeve at the front end of the feeding of the upper and lower dies of the plate type 1 and 3 forms a translational constraint on the bar stock 2. The bar stock 2, driven by the upper and lower dies of the plate type 1 and 3, rotates in the fixed position of the sleeve, and is first slotted, and then bent and unloaded.

[0059] like Figure 7As shown, the cross-section obtained by the traditional shearing method is as shown on the right side of (a) and (b) for the bar stock, while the cross-section obtained by the device and method of the present invention is shown on the left side of (a) and (b) for the bar stock. A comparison of the two clearly shows that the cross-section obtained by the method of the present invention is smoother, has fewer burrs, and has higher precision.

[0060] While several embodiments of the present invention have been provided herein, those skilled in the art should understand that modifications can be made to these embodiments without departing from the spirit of the invention. The above embodiments are merely exemplary and should not be construed as limiting the scope of the invention.

Claims

1. A billet plate type groove bending and brittle fracture blanking device, characterized by, The device includes an upper plate mold and a lower plate mold arranged opposite to each other, both of which are flat. The plate-type lower mold is a punch, which is sequentially set with a grooving section, a transition loading section, a loading section, and a transition unloading section, and is used to groove and bend the bar tube material to prevent brittle fracture. The plate-type upper mold is a concave mold, which is provided with a slotted section and a mating section corresponding to the slotted section, transition loading section, loading section and transition unloading section; The lower plate mold and the upper plate mold move towards each other at the same speed, with the direction of movement perpendicular to the axis of the bar material, to groove, bend and break the bar material to complete the blanking; The slotted section of the plate-type lower die is provided with a first protruding ridge with a gradually increasing height, which is used to roll a V-shaped groove on the bar material. The length of the first protruding ridge is greater than the circumference of the bar material. The slotted section of the plate mold is provided with a second protruding ridge corresponding to the first protruding ridge, and the first and second protruding ridges are symmetrically arranged with the bar material as the center. The transition loading section of the lower plate mold is provided with a break-tapered boss that gradually rises along the bar stock axis; the transition loading mating section of the upper plate mold is provided with a break-tapered recess corresponding to the break-tapered boss. The loading section of the lower plate mold is provided with a broken taper boss of fixed height; the loading mating section of the upper plate mold is provided with a broken taper recess corresponding to the broken taper boss.

2. The tube blank plate-and-roller bending and breakage blanking apparatus of claim 1, wherein The included angle α of the V-shaped groove is 90°, the radius r of the bottom fillet is 0.1~0.3mm, and the ratio of the groove depth h to the diameter D of the bar / tube material is 0.15~0.

2.

3. The tube bar blanking apparatus of claim 1, wherein the bending and breaking device comprises a bending roll and a breaking roll. The taper of the broken tapered boss is 7°-9°.

4. The tube bar blanking apparatus of claim 1, wherein the bending and breaking device comprises a bending roll and a breaking roll. The front end of the slotted section of the plate-type lower mold is provided with a wedge fixing groove that limits the starting position of the round bar tube. The wedge fixing groove is an arc groove.

5. The tube bar blank plate and roll bending and breakage blanking device as claimed in claim 1, wherein The rear end of the transition unloading section of the plate-type lower mold is provided with a groove for receiving rod and tube parts.

6. The tube rod blank plate-and-die bending and brittle breaking blanking apparatus according to claim 1, wherein The material of the rod and tube stock is a cold-brittle material, including high-strength steel and alloy steel.

7. A method of bending and breaking a bar tube stock sheet into a groove by a plate bending method, characterized by, The method uses the bar / tube plate type groove bending and brittle fracture feeding device as described in any one of claims 1-6, and the method includes the following steps: S1. Feeding: The bar / tube material is fed to the starting rolling position at the front end of the slotted section of the lower plate die. S2. Grooving and bending: The lower plate die and the upper plate die move towards each other at the same speed. The bar and tube material is rolled into a V-groove under the action of the gradually rising convex ridge in the grooving section. After passing through the transition loading section, the blanking section is bent and brittlely broken under the bending force of the breaking tapered boss in the loading section. The blanking section is collected after being unloaded in the transition unloading section. S3. The lower plate die and the upper plate die return to their initial positions, and the material is fed back to the starting rolling position. Repeat steps S1-S2 to complete continuous feeding.

8. The method for blanking bar / tube stock by bending and brittle fracture as described in claim 7, characterized in that, In step S1, a feeding device is used to feed the bar tube material to the wedge fixing groove at the front end of the slotted section of the plate-type lower mold. In step S2, the material unloading section is collected into the groove after being unloaded in the transition unloading section.

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