CN105215252A - The forming technology of the mould of preform 45 ° of skew T jumping-up parts, method and 45 ° of skew Ts - Google Patents

Abstract

The invention provides a mold for preforming a 45° oblique tee upsetting part, a method and a forming process of a 45° oblique tee. The thick upsetting rod, the base placed in the blank forming cylinder and at the bottom of the cavity, the punching bottom arranged in the base, an opening communicating with the cavity is provided on the upper part of the blank forming cylinder, and the base has a pair of The flat part of the base is provided with an opening, the lower end of the upsetting rod extends into the cavity through the opening, and the distance between the bottom end of the upsetting rod and the flat part of the base The distance is greater than or equal to 640mm and less than or equal to 660mm, so that the height of the left and right sides of the final formed part of the 45° oblique tee is basically the same, and there are no forging defects such as folding and flow-through, and the final forming effect of the 45° oblique tee is relatively good. The machining allowance will be less and save material.

Description

Mold and method of preforming 45° oblique tee upsetting parts and forming process of 45° oblique tee

technical field

The invention relates to a mold and a method for preforming a 45° oblique tee upsetting piece and a forming process of a 45° oblique tee.

Background technique

P91 (10Cr9Mo1VNb) inclined tee is widely used in electric power, petroleum, chemical industry, machinery manufacturing, shipbuilding, national defense and other fields. As a key basic structural part, it is required to have excellent comprehensive performance under high temperature and high pressure. The high temperature stability and thermal strength of the P91 material, high deformation resistance, low plasticity and the high performance required for the oblique tee determine that the manufacture of the P91 oblique tee requires a thermoplastic processing method. The traditional method of producing 45° oblique tees generally adopts solid free forging and subsequent machining. Among them, free forging requires more than 5 fires, long forging cycle, long machining time, and low material utilization.

Contents of the invention

The main purpose of the present invention is to provide a mold, method and forming process of a preformed 45° oblique tee upsetting piece which is beneficial to improve the forming effect of the 45° oblique tee.

The present invention provides a mold for preforming a 45° oblique three-way upsetting piece, which includes a blank-making cylinder with a cavity, an upsetting rod for upsetting the upsetting blank in the cavity, and a The base in the base making cylinder and located at the bottom of the mold cavity, the punch bottom arranged in the base, an opening communicating with the mold cavity is provided on the upper part of the base making cylinder, and the base has a positive The base plane portion provided for the opening, the lower end of the upsetting rod extends into the cavity through the opening, and when the step of preforming the 45° oblique tee upsetting piece by the mold is completed, the upsetting The distance between the bottom end surface of the thick rod and the plane part of the base is greater than or equal to 640mm and less than or equal to 660mm.

With the above structure, the height of the left and right sides of the final formed part of the 45° oblique tee is basically the same, and there are no forging defects such as folding and flow-through. The final forming effect of the 45° oblique tee is relatively good, and the machining allowance will be relatively small , relatively economical.

Preferably, the distance between the bottom end surface of the upsetting rod and the flat surface of the base is any one of 640mm, 650mm, and 660mm.

The present invention also proposes a method for preforming a 45° oblique tee upsetting piece, including any one of the aforementioned molds, and when using the mold to preform a 45° oblique tee upsetting piece, the upsetting The lower end of the upsetting rod extends into the cavity through the opening to upset the upsetting blank until the distance between the bottom end surface of the upsetting rod and the flat surface of the base is greater than or equal to 640 mm and less than or equal to 660 mm.

Using the above method, the height of the left and right sides of the final formed part of the 45° oblique tee is basically the same, and there are no forging defects such as folding and flow-through. The final forming effect of the 45° oblique tee is relatively good, and the machining allowance will be relatively large. Less, more economical.

The present invention also proposes a forming process of a 45° oblique tee, including: step 1, upsetting the billet of the 45° oblique tee; step 2, performing back-extrusion processing on the formed part formed in step 1 ; Step 3, perforating the formed part formed in step 2; Wherein, in step 1, when utilizing the mold to preform the 45 ° oblique tee upsetting step, the bottom end surface of the upsetting bar The distance to the plane part of the base is greater than or equal to 640mm and less than or equal to 660mm.

Using the above forming process, the height of the left and right sides of the final formed part of the 45° oblique tee is basically the same, and there are no forging defects such as folding and flow-through. The final forming effect of the 45° oblique tee is relatively good, and the machining allowance will be reduced. Less, more material saving.

Preferably, in step 2, the formed part formed in step 1 is subjected to back-extrusion treatment using a back-extrusion die, wherein the difference between the back-extrusion die and the aforementioned die is that a punch is used instead of the upset A thick rod, through which the upsetting piece formed in step 1 is subjected to back-extrusion processing.

Preferably, in step 3, the formed part formed in step 2 is perforated by using a perforating die, wherein the difference between the perforating die and the reverse extrusion die is that the bottom punching is not included.

Description of drawings

Fig. 1 is the structural representation of 45 ° oblique tee;

Fig. 2 is the schematic diagram that utilizes mold to carry out upsetting process to the formed part of 45 ° oblique tee;

Fig. 3 is the schematic diagram that utilizes mold to carry out perforation process to the formed part of 45 ° inclined tee;

Figure 4 is a schematic diagram of the metal streamlines corresponding to the formed parts of the 45° oblique tee under various technological processes;

Figure 5 is the forming effect diagram of the 45° oblique tee within the upsetting height of 640-660mm;

Figure 6 is the forming effect diagram of the 45° oblique tee with the upsetting height not within 640-660mm.

detailed description

Referring to Fig. 1 to Fig. 6 below, the mold, method and forming process of the preformed 45° oblique tee upsetting part according to the present invention will be described in detail.

As shown in FIG. 1 , the 45° inclined tee 6 usually includes a main pipe piece 61 and a branch pipe piece 62 that intersect at 45 degrees and are connected to each other. The 45° inclined tee 6 can be made of metal or plastic. In the present invention, the 45° oblique tee 6 is mainly formed by the following technological process, which specifically includes the following steps:

Step 1, upsetting the blank of the 45° oblique tee;

Step 2, performing back-extrusion processing on the formed part formed in step 1;

Step 3, perforating the formed part formed in step 2.

Wherein, the upsetting process in step 1 is realized by using the upsetting mold shown in FIG. 2 . As shown in Figure 2, the upsetting mold mainly includes a blank cylinder 2, and a cavity 21 corresponding to the shape and size of the finished product of the 45° oblique tee is arranged approximately in the center of the blank cylinder 2. 2 is provided with an opening 22 communicating with the cavity 21. A base 3 is provided at the bottom of the cavity 21 at the bottom of the blank-making cylinder 2. The base 3 has a base plane portion 31 facing the aforementioned opening 22, and a 45° oblique tee is provided on the base plane portion 31. The bore diameter of the main pipe piece 61 is consistent and the upper and lower ends of the avoidance hole 32 pass through, and a punching bottom 4 is arranged in the escape hole 32 . The upsetting mold also includes an upsetting rod 1 for upsetting the upsetting blank in the cavity 21. The upper end of the upsetting rod 1 is usually connected with the press slide block used to provide pressure, and its lower end can pass through the aforementioned The opening 22 extends into the cavity 21 to perform upsetting treatment on the upsetting blank.

The following briefly describes the working principle of the upsetting die when using the upsetting die shown in FIG. 2 for the upsetting process.

First, the blank used to make the 45° oblique tee is placed in the cavity 21 of the mold shown in Figure 2, and the upsetting rod 1 moves downward under the drive of the slider of the press and enters the cavity 21 to upset the blank Processing, in this upsetting process, the height of the blank in the up and down direction decreases, when the distance between the bottom end surface of the upsetting rod 1 and the base plane part 31 is greater than or equal to 640 mm and less than or equal to 660 mm, in other words, the upsetting When the upsetting height of the piece is greater than or equal to 640mm and less than or equal to 660mm, the upsetting mold stops working, and the upsetting process ends, and the upsetting rod 1 exits the cavity 21 under the drive of the press slider. Wherein, the foregoing distance may be any one of 640mm, 650mm, and 660mm.

Step 2 and step 3 are realized by using back-extrusion die and piercing die respectively. Among them, the difference between the reverse extrusion die and the upsetting die shown in Fig. 2 is only that the punch 5 in the perforating die shown in Fig. 3 is used to replace the upsetting rod 1 shown in Fig. 1 The formed upsetting parts are subjected to back extrusion treatment. In step 2, the punch 5 moves downwards and enters the cavity 21 under the drive of the slider of the press to perform back-extrusion treatment on the upsetting piece formed in step 1, and the upsetting piece gradually fills the entire mold under the back-extrusion treatment. Cavity 21. When the anti-extrusion die performs anti-extrusion processing on the formed part of the 45° tee to the predetermined requirement, the anti-extrusion process ends.

As shown in Figure 3, the difference between the piercing die and the upsetting die shown in Figure 2 is that the punch 5 in the piercing die shown in Figure 3 is used to replace the upsetting rod 1 shown in Figure 2, and at the same time, the upsetting rod 1 shown in Figure 2 is removed. Punch bottom 4 shown. In step 3, the punch 5 moves downwards and enters the cavity 21 under the drive of the press slider to punch the formed part formed in step 2. When the punch 5 forms an edge along the formed part formed in step 2, When there is a through hole (ie the through hole on the main tube 61 ) in the up and down direction, the perforation process ends, and the punch 5 is withdrawn in the opposite direction under the drive of the slide block of the press, thus completing the perforation process.

In the present invention, since in step 1, when the step of preforming the 45° oblique tee upsetting piece by the mold is completed, the distance between the bottom end surface of the upsetting rod 1 and the base plane part 31 is greater than or equal to 640mm and less than or equal to 660mm, Make the metal streamline distribution of the formed parts in each process step good, as shown in Figure 4, in which Figure 4(a) is a schematic diagram of the metal streamline distribution of the formed part in the upsetting step, and Figure 4(b) is the reverse extrusion Schematic diagram of the technical streamline distribution of the formed part in the pressing step, Figure 4(c) is a schematic diagram of the metal streamline distribution of the formed part in the piercing step, and, as shown in Figure 5, the left and right sides of the final formed part of the 45° oblique tee The height of both sides is basically the same, and there are no forging defects such as folding and flow-through. The final forming effect of the 45° inclined tee is better, and the machining allowance will be relatively small, which saves material.

If the distance between the bottom end surface of the upsetting rod 1 and the base plane part 31 is less than 640mm or greater than 660mm, the height difference between the left and right sides of the final formed part of the 45° oblique tee is obvious, and the final forming effect is relatively poor. Specifically as shown in Figure 6, when the upsetting height is 780-660mm, the right side of the 45° oblique tee is higher than the left side; when the upsetting height is 640-600mm, the right side of the 45° oblique tee appears again In the case of the left side, and when the upsetting height is 600mm, there are obvious defects in the oblique tee.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (6)

1. A mold for preforming a 45 ° oblique tee upsetting part, comprising a base making cylinder (2) with a cavity (21), an upsetting tool for upsetting the upsetting blank in the cavity (21) A thick rod (1), a base (3) placed in the blank-making cylinder (2) and at the bottom of the cavity, and a punching bottom (4) arranged in the base (3), are characterized in that, An opening (22) communicating with the mold cavity (21) is provided on the upper part of the billet making cylinder (2), and the base (3) has a base plane portion (31) that is directly set to the opening (22). ), the lower end of the upsetting rod (1) extends into the cavity (21) through the opening (22), At the end of the step of using the mold to preform the 45° oblique tee upsetting piece, the distance between the bottom end surface of the upsetting rod (1) and the base plane part (31) is greater than or equal to 640mm and less than or equal to 660mm. 2. The mold according to claim 1, characterized in that, the distance between the bottom end surface of the upsetting rod (1) and the base plane part (31) is any one of 640mm, 650mm, and 660mm . 3. A method for preforming a 45° oblique tee upsetting piece, characterized in that it comprises any one of the molds in claims 1 to 2, When using the mold to preform a 45° oblique tee upsetting step, the lower end of the upsetting rod (1) extends into the cavity (21) through the opening (22) to upset the upsetting blank Press until the distance between the bottom end surface of the upsetting rod (1) and the base plane part (31) is greater than or equal to 640mm and less than or equal to 660mm. 4. A forming process for a 45° inclined tee, characterized in that it comprises: Step 1, upsetting the blank of the 45° oblique tee; Step 2, performing back-extrusion processing on the formed part formed in step 1; Step 3, perforating the formed part formed in step 2; Wherein, in step 1, the distance between the bottom end surface of the upsetting rod (1) and the base plane part (31) is Greater than or equal to 640mm and less than or equal to 660mm. 5. The forming process according to claim 4, characterized in that, in step 2, the formed part formed in step 1 is subjected to back-extrusion treatment using a back-extrusion die, wherein the back-extrusion die is the same as the aforementioned The difference between the molds in claims 1-2 is that the upsetting rod (1) is replaced by a punch (5), and the upsetting piece formed in step 1 is subjected to back-extrusion treatment through the punch (5). 6. The forming process according to claim 5, characterized in that, in step 3, a piercing die is used to perforate the formed part formed in step 2, wherein the piercing die and the reverse extrusion die The difference is that the bottom punch (4) is not included.