High-precision hot upsetting combined die

Abstract

The utility model discloses a high-precision hot upsetting combined die which comprises a forming female die and a taper hole molded surface lower die. The forming female die is sleeved on the taper hole molded surface lower die and consists of an upper die sleeve (1) and an upper die core (2), the upper die sleeve (1) is sleeved outside the upper die core (2), the taper hole molded surface lower die consists of a lower die core (3), a lower die sleeve (4) and an ejector rod (5), the upper end of the lower die sleeve (4) is inserted into the lower die core (3), the lower end of the lower die sleeve (4) is inserted into the ejector rod (5), and the upper die core (2) is sleeved outside the lower die sleeve (4). Original using and upsetting modes are not changed, the coaxiality of parts is guaranteed, functional requirements are met, and the die is economical and practical.

Description

Technical Field

[0001] The utility model belongs to the technical field of molds, and in particular relates to a high-precision hot upsetting combined mold. Background Art

[0002] Hot upsetting has always been the forming method for high-strength bolts. Due to the particularity of the forming method, two or more molds are used in combination during forming. The two molds need to be installed and positioned on the equipment before they can be used. The installation produces matching tolerances, plus the manufacturing tolerances of the two molds, resulting in a large cumulative error. Although the metal streamline and performance strength of the parts are guaranteed after hot upsetting, the shape and position tolerances such as the coaxiality of the head to the rod are quite different. The accuracy of hot upsetting needs to be improved. Summary of the invention

[0003] The utility model aims to overcome the above disadvantages and provide an economical and practical high-precision hot upsetting combined die which does not change the original use and upsetting method, ensures the coaxiality of parts, meets functional requirements.

[0004] The purpose of the utility model and the solution of its main technical problems are achieved by adopting the following technical solutions:

[0005] The utility model discloses a high-precision hot upsetting combined die, comprising a forming concave die and a tapered hole profile lower die, and is characterized in that the forming concave die is sleeved on the tapered hole profile lower die, the forming concave die is composed of an upper die sleeve and an upper die core, the upper die sleeve is sleeved outside the upper die core, the tapered hole profile lower die is composed of a lower die core, a lower die sleeve and a push rod, the upper end of the lower die sleeve is inserted into the lower die core, the lower end is inserted into the push rod, and the upper die core is sleeved outside the lower die sleeve.

[0006] The upper die sleeve is in the shape of a trumpet that is small at the top and large at the bottom.

[0007] The upper mold core is in the shape of a trumpet that is smaller at the top and larger at the bottom, with a groove at the center and exhaust ports that penetrate the upper and lower parts.

[0008] A through hole which is larger at the top and smaller at the bottom is arranged at the center of the lower mold core.

[0009] The outer surface of the upper end of the lower die sleeve is conical.

[0010] Compared with the prior art, the utility model has obvious beneficial effects; from the above technical scheme, it can be seen that: the forming die is sleeved on the lower die of the tapered hole profile, the forming die is composed of an upper die sleeve and an upper die core, the upper die sleeve is sleeved outside the upper die core, the lower die of the tapered hole profile is composed of a lower die core, a lower die sleeve, and a push rod, the upper end of the lower die sleeve is inserted into the lower die core, the lower end is inserted into the push rod, and the upper die core is sleeved outside the lower die sleeve. During hot upsetting, the forming die is fixed on the movable slider vertically above, and the lower die of the tapered hole profile is fixed to the lower die seat, such as Figure 4As shown. During forming, the lower die does not move, and the heated part is placed in the lower die of the tapered hole profile. The moving slider is started to move the forming die downward, and the forming die cavity contacts the lower die of the tapered hole profile. At this time, the forming die cavity plays a guiding role and corrects the coaxiality with the lower die. Under the guiding and correcting action, the blank part enters the forming die cavity and is formed by upsetting, which better guarantees the coaxiality requirement of the part head to the rod. By making the guide hole of the forming die and the twelve-sided die into one piece, both are processed and formed with the outer circle as the reference, and the coaxiality tolerance of the twelve-sided die and the guide hole is reduced. At the same time, the outer circle of the lower die of the tapered hole profile is matched and manufactured with the guide hole of the forming die as the reference, and the inner hole of the lower die of the tapered hole profile is designed and processed with the outer circle as the center, thereby reducing the coaxiality tolerance of the forming die and the lower die of the tapered hole profile, which can meet the requirement of the coaxiality of the part head to the light rod ≤0.1mm, and achieve the expected effect of the design. The original use and upsetting method are not changed, the coaxiality of the parts is guaranteed, the functional requirements are met, and it is economical and practical. And only the structure and size of the twelve-sided die need to be changed, and other structures remain unchanged, so it can be applied to the upsetting of other parts head shapes, such as hexagonal die, D-type die, etc. The application of high-precision combined design structure is promoted. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a top view of the utility model;

[0012] Figure 2 yes Figure 1 Sectional view of AA;

[0013] Figure 3 It is a top view of the upper die sleeve and the upper die core of the utility model;

[0014] Figure 4 yes Figure 3 Cross-sectional view of BB;

[0015] Figure 5 It is a partial cross-sectional view of the lower die core, lower die sleeve and ejector pin of the utility model;

[0016] Figure 6 It is the use state of the utility model Figure 1 ;

[0017] Figure 7 It is the use state of the utility model Figure 2 .

[0018] Marking in the figure

[0019] 1. Upper die sleeve, 2. Upper die core, 3. Lower die core, 4. Lower die sleeve, 5. Ejector pin, 6. Exhaust port, 7. Blank parts. DETAILED DESCRIPTION

[0020] The specific implementation methods, structures, features and functions of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0021] The utility model discloses a high-precision hot upsetting combined die, comprising a forming concave die and a tapered hole profile lower die, and is characterized in that the forming concave die is sleeved on the tapered hole profile lower die, the forming concave die is composed of an upper die sleeve 1 and an upper die core 2, the upper die sleeve 1 is sleeved on the outside of the upper die core 2, the tapered hole profile lower die is composed of a lower die core 3, a lower die sleeve 4 and a push rod 5, the lower die sleeve 4 is inserted into the lower die core 3 at the upper end and the push rod 5 at the lower end, the upper die core 2 is sleeved on the outside of the lower die sleeve 4, the upper die sleeve 1 is a trumpet shape with a small upper part and a large lower part, the upper die core 2 is a trumpet shape with a small upper part and a large lower part, a groove is arranged in the center, an exhaust port 6 is arranged which penetrates from top to bottom, a through hole with a large upper part and a small lower part is arranged in the center of the lower die core 3, and the outer surface of the upper end of the lower die sleeve 4 is tapered.

[0022] When in use, the combined mold is Figure 5 and Figure 6 After being assembled on the hot upsetting equipment in the manner of, the forming die is used as the upper die, which is installed on the slider body and can move up and down. The lower die of the tapered hole profile is used as the lower die, which is fixed to the lower die seat and cannot be moved. The center of the forming die is on the same center line as the vertical direction of the lower die of the tapered hole profile. The heated blank part 7 is placed in the hole of the lower die core 3 and the lower die sleeve 4 of the lower die of the tapered hole profile. The upper die slider body is started, and the upper die sleeve 1 and the upper die core 2 of the forming die move downward. The inner hole of the upper die core 2 contacts the outer circle of the lower die sleeve 4 of the lower die of the tapered hole profile, forming a guiding and correcting effect. The blank part 7 continues to move downward, and enters the twelve-angle mold cavity of the upper die core 2. Under the action of pressure, the material of the blank part 7 is plastically deformed to form a twelve-angle head shape. At the same time, the coaxiality of the head and the rod is formed. After measuring the hot upsetting parts, the coaxiality is in the range of 0.04-0.1. The combined mold improves the coaxiality and improves the part precision.

[0023] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A high-precision hot upsetting combined die, comprising a forming die and a tapered hole profile lower die, characterized in that; The forming concave die is sleeved on the lower die of the tapered hole profile. The forming concave die is composed of an upper die sleeve (1) and an upper die core (2). The upper die sleeve (1) is sleeved outside the upper die core (2). The tapered hole profile lower die is composed of a lower die core (3), a lower die sleeve (4), and a push rod (5). The upper end of the lower die sleeve (4) is inserted into the lower die core (3), and the lower end is inserted into the push rod (5). The upper die core (2) is sleeved outside the lower die sleeve (4).

2. A high-precision hot upsetting combined die as claimed in claim 1, characterized in that; The upper die sleeve (1) is in the shape of a trumpet that is smaller at the top and larger at the bottom.

3. A high-precision hot upsetting combined die as claimed in claim 1, characterized in that; The upper mold core (2) is trumpet-shaped and smaller at the top and larger at the bottom, with a groove provided at the center and an exhaust port (6) extending upward and downward.

4. A high-precision hot upsetting combined die as claimed in claim 1, characterized in that; A through hole which is larger at the top and smaller at the bottom is provided at the center of the lower mold core (3).

5. A high-precision hot upsetting combined die as claimed in claim 1, characterized in that; The upper end of the lower die sleeve (4) is tapered on the outside.

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