Three-column groove shell blank machining technology for correcting rod bounce out-of-tolerance

Abstract

The invention provides a three-column groove shell blank machining process for correcting rod run-out overproof, which comprises the procedures of blanking, shot blasting, coating, heating, warm forging forward extrusion, upsetting, reverse extrusion, controlled cooling, shot blasting, phosphorus saponification and finishing, specifically, the rod run-out amount of a workpiece obtained in the reverse extrusion procedure is firstly measured, and a mark is made at the lowest point position of rod run-out; in the finishing process, two of the three petals on the end face of the finishing punch are provided with protruding steel seals, then the lowest point position, marked on the workpiece, of rod jumping is aligned with the petals without the steel seals, then conventional finishing operation is conducted, and the rod jumping out-of-tolerance of the workpiece is reduced. The device has the advantages of correcting the out-of-tolerance of rod jumping, improving the product percent of pass and the like.

Description

Technical Field

[0001] The invention relates to the field of mold processing, and in particular to a three-column slot shell blank processing technology for correcting excessive runout of a rod portion. Background Art

[0002] Cold finishing is one of the commonly used forming methods in the forging industry, and is generally the final finishing of forgings. The three-column slot shell or cylindrical shell on the automotive parts has a high precision requirement for the inner cavity shape and the shell shape. In order to ensure the accuracy of the inner and outer dimensions of the forgings, a process method of warm forging and cold finishing combined forming is adopted, that is, warm forging is used to complete the extrusion with a large deformation, first obtain the basic shape of the forging, and then use 20% to 30% of the finishing deformation to complete the finishing of the forging. After the roughcast is finished, the inner cavity of the shell is generally used as the reference, and the rod shape is machined to finally obtain the parts with precise dimensions. The machining allowance of the roughcast rod diameter is generally 2 to 2.5 mm on both sides. According to long-term on-site practice, the greater the runout of the back-extrusion rod, the greater the runout of the rod after finishing. If the three-column slot shell roughcast is finished with the inner cavity as the reference, and the rod runout exceeds 1.8 mm, there will be a risk of black skin that cannot be turned out of the rod, resulting in product scrapping.

[0003] Therefore, it is necessary to provide a new technical solution. Summary of the invention

[0004] In order to solve the technical problems existing in the prior art, the present invention discloses a three-column slot shell blank processing technology for correcting the excessive deviation of the rod part runout. The specific technical scheme is as follows:

[0005] The present invention provides a three-column tank shell blank processing technology for correcting the excessive deviation of the rod part runout, including blanking, shot blasting, coating, heating, warm forging forward extrusion, upsetting, reverse extrusion, controlled cooling, shot blasting, phosphorus saponification and finishing processes.

[0006] Among them, the runout of the rod of the workpiece obtained in the back-extrusion process is first measured, and a mark is made at the lowest point of the runout of the rod;

[0007] In the finishing process, raised steel stamps are set on two of the three petals on the end face of the finishing punch, and then the lowest point of the rod runout marked on the workpiece is aligned with the petal without the steel stamp, and then conventional finishing operations are performed to reduce the rod runout tolerance of the workpiece.

[0008] Furthermore, the height of the steel stamp protrusion is 0.7 mm.

[0009] Furthermore, the distance between the two steel stamps in the diameter direction of the end face of the precision punch is the same, and the position in the circumferential direction can be adjusted.

[0010] The present invention has the following beneficial effects:

[0011] In the present application, the two petals with steel stamps on the finishing punch have a certain height of end face steel stamps, so the end faces of the two petals will first contact the bottom of the forging during finishing extrusion. This unbalanced force will cause the central axis of the forging to rotate slightly, and at the rod end of the forging, it will rotate toward the petal without steel stamps, thereby correcting the rod runout. The three-column slot shell blank processing process for correcting the rod runout error provided by the present invention can correct the rod runout error error without affecting the original process, improve the product qualification rate, and reduce the scrap loss of the product.

[0012] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 It is a structural diagram of the end face of the finishing punch provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0015] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0016] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In the description of the present invention, "plurality" means two or more, unless otherwise clearly and specifically defined.

[0017] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0018] The invention discloses a three-column tank shell blank processing technology for correcting the excessive deviation of the rod part runout, which is characterized by comprising blanking, shot blasting, coating, heating, warm forging forward extrusion, upsetting, reverse extrusion, controlled cooling, shot blasting, phosphorus saponification and finishing processes.

[0019] Among them, the runout of the rod of the workpiece obtained in the back-extrusion process is first measured, and a mark is made at the lowest point of the runout of the rod;

[0020] In the finishing process, a raised steel stamp is set on two of the three petals on the end face of the finishing punch, and then the lowest point of the rod runout marked on the workpiece is aligned with the petal without a steel stamp, and then conventional finishing operations are performed to reduce the rod runout tolerance of the workpiece.

[0021] The height of the steel stamp is 0.7mm.

[0022] The distance between the two steel stamps in the diameter direction of the precision punch end face is the same, and the position in the circumferential direction can be adjusted, thereby maximally reducing the rod runout.

[0023] In one embodiment, reference Figure 1 There are two steel stamps on the end face of the finishing punch. The numbers and letters on the steel stamps can represent the company name, product material and mold number of the finishing punch. Each product has a different steel stamp number.

[0024] The present application adds a method for correcting the runout tolerance without affecting the original production process. Referring to Table 1, a better correction effect can be obtained.

[0025] Table 1:

[0026] Workpiece number Anti-extrusion rod jump Shaft runout after finishing Improvement in rod runout 1 1.75 1.3 0.45 2 1.68 1.1 0.58 3 1.5 0.85 0.65 4 1.7 0.9 0.8 5 2.0 1.05 0.95 6 1.5 0.6 0.9 7 1.7 0.75 0.95 8 2.65 1.6 1.05 9 2.5 1.7 0.8 10 2.1 0.95 1.15

[0027] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0028] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify and vary the above embodiments within the scope of the present invention.

Claims

1. A three-column tank shell blank processing process for correcting the excessive deviation of the rod part, characterized in that: Including blanking, shot blasting, coating, heating, warm forging extrusion, upsetting, reverse extrusion, controlled cooling, shot blasting, phosphorus saponification and finishing processes. Among them, the runout of the rod of the workpiece obtained in the back-extrusion process is first measured, and a mark is made at the lowest point of the runout of the rod; In the finishing process, raised steel stamps are set on two of the three petals on the end face of the finishing punch, and then the lowest point of the rod runout marked on the workpiece is aligned with the petal without the steel stamp, and then conventional finishing operations are performed to reduce the rod runout tolerance of the workpiece.

2. The three-column tank shell blank processing process for correcting the excessive deviation of the rod part according to claim 1 is characterized in that: The height of the steel stamp is 0.7mm.

3. The three-column tank shell blank processing process for correcting the excessive deviation of the rod part according to claim 1 is characterized in that: The distance between the two steel stamps in the diameter direction of the precision punch end face is the same, and the position in the circumferential direction can be adjusted.

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