Several unrelated forms in the same page.

multiple-form.php

public function acmeAction()
{
    $acme = new Acme();

    $form = $this->get('form.factory')
            ->createNamedBuilder(new AcmeType(), 'acme_form', $acme)
            ->getForm();

    $request = $this->getRequest();


    if ($request->getMethod() == 'POST' && $request->request->has('acme_form')) {

        $form->bindRequest($request);

        if($form->isValid())
        {
            //do something
        }
    }

    //return something
}