In the process of assembling the mold base, how to simply press the guide post into the guide sleeve?

As the basic component of the stamping die, the die set often takes a lot of time to press the guide post into the guide sleeve during the assembly process. How to simply press the guide post into the guide sleeve in the process of assembling the die set? ? (1) When pressing the guide post, the press can not directly press on the guide post. The guide post, guide sleeve and upper and lower die holders of the press-in mold base are fixed, and the interference fit H7/r6 is adopted. The connection between the guide post, the guide sleeve and the mold base is reliable, and the guide post and guide sleeve have a good fit clearance, so it is widely used in cold stamping dies. But it should be noted that before fixing the guide post and the guide sleeve, the. The holes on the upper and lower mold bases are chamfered and wiped clean. When assembling the press-fit guide post, attention should be paid to maintaining the verticality of the guide post and not to damage the guide post. Generally, a manual press is used to press the guide post into the lower mold base, so that the pressure is uniform and the operation is very convenient. When pressing, the press is not directly pressed on the guide post, which is easy to damage the guide post. Instead, a dome-shaped block is used. The pressure block is placed in the center of the guide post to ensure that the pressure is consistent with the axis direction of the guide post. (2) When pressing the guide post, do not press the guide post in one time. During the process of pressing the guide post, you cannot press the guide post to the end at one time, but after pressing in 3-5mm, check the verticality of the guide post. If the verticality of the guide post axis to the lower plane of the lower mold base meets the perpendicularity requirements of the assembly, press the guide post all the way in, and leave a margin of 1~3mm between the lower plane of the guide post and the lower plane of the lower mold base. (3) When pressing the long guide post, the guide post must not be crimped and pressed into the guide post carefully to prevent the guide post from crooking. After the guide pin is crooked, it is not only difficult to close the upper and lower molds, but also difficult to correct after crooked. The long guide post is easy to be crooked. In order to avoid crooking, you can use the method shown in Figure 9-45. First, padded a contour block between the upper and lower mold seats, insert the guide post into the installed guide sleeve, and press Press the guide pin into the lower mold base by 5~6mm on the machine, lift the upper mold base to the highest position that does not deviate from the guide pin by hand, and then lower it. If the upper mold base and the two pads are in different tightness, adjust the guide. Until the contact is tight and uniform, the guide post is finally pressed into the lower mold base, so that it is more convenient to ensure that the long guide post is not crooked. (4) The guide posts and guide sleeves should not be pressed in separately. In order to ensure a uniform and good fit gap between the guide posts and guide sleeves, it is recommended that the guide posts and guide sleeves be press-fitted together. The method is: put the lower die seat of the pressed guide post on the worktable of the press, and pad with a special support ring; put the upper die seat inverted (the upper plane of the upper die seat is below) and insert it into the guide post Inside; sleeve the guide sleeve into the guide post, slowly press the guide sleeve into the upper die seat under the action of the press, check whether the guide sleeve and the upper die seat are perpendicular, and whether the guide sleeve fits well in the guide post; finally, the guide sleeve The sleeve is pressed in and its upper end surface is lower than the upper surface of the upper mold base by 1-3 nm. (5) The movement of the guide post of the mold base and the guide sleeve should not have hysteresis. When stamping, the upper part of the mold slides up and down along the guide post. If the movement of the guide post of the mold base and the guide sleeve is uneven, there will be hysteresis. , The guide post and guide sleeve will be scratched. Over time, the gap between the guide post and guide sleeve will increase due to wear, and the gap of the mold will not be guaranteed. It is easy to punch out waste products and easily cause mold gnawing accidents. In addition, the movement of the guide post and guide sleeve of the mold base has a hysteresis, which will also bring difficulties to the assembly and disassembly of the mold. (6) It is not advisable to ignore the use of bonded mold bases. The guide posts and guide sleeves of the mold base are generally fitted with the mold base by interference fit and press-fit assembly. But there are also bonding processes. For the assembled mold base, the axis of the guide post and the guide sleeve hole must be perpendicular to the base plane of the mold base, and the center of the guide post and guide sleeve should be coincident, the upper mold base moves up and down along the guide post smoothly, and there is no time to tighten or loose. . The bonded cold punching die set has the advantages of simple operation and reliable quality. It does not require high processing requirements for the upper and lower die seat holes and does not require special equipment. Removable guide post, the guide post and the conical mounting sleeve must be coaxial. The non-removable guide post, the guide post and the guide sleeve are firmly bonded to the mold base with adhesive. Previous post: What are the precautions when designing and processing the discharge plate of the stamping die